Help with javascript

hey, i’ve been struggling with this problem for a long time now. I can’t seem to get an alert showing the total i want to be alerted.
Does anyone have some advise??
Thanks in advance

Code =

<!DOCTYPE html>
<html lang="nl">
<head>
<meta charset="utf-8">
<title>Epic Computers</title>
<link rel="stylesheet" type="text/css"
href="csswebsite2.css">
<script type="text/javascript">
function berekening() {
if (document.mijnForm.pckast1.value.checked) {
	document.mijnForm.pckast1.value = "62.50";} else {document.mijnForm.pckast1.value = "0"}
if (document.mijnForm.pckast2.checked) {
	document.mijnForm.pckast2.value = "92.50";} else {document.mijnForm.pckast2.value = "0"}
if (document.mijnForm.pckast3.checked) {
	document.mijnForm.pckast3.value = "92.50";} else {document.mijnForm.pckast3.value = "0"}
if (document.mijnForm.pckast4.checked) {
	document.mijnForm.pckast4.value = "92.50";} else {document.mijnForm.pckast4.value = "0"}
if (document.mijnForm.pckast5.checked) {
	document.mijnForm.pckast5.value = "118.50";} else {document.mijnForm.pckast5.value = "0"}
if (document.mijnForm.pckast6.checked) {
	document.mijnForm.pckast6.value = "123.50";} else {document.mijnForm.pckast6.value = "0"}
if (document.mijnForm.pckast7.checked) {
	document.mijnForm.pckast7.value = "143.50";} else {document.mijnForm.pckast7.value = "0"}
if (document.mijnForm.pckast8.checked) {
	document.mijnForm.pckast8.value = "192.50";} else {document.mijnForm.pckast8.value = "0"}
if (document.mijnForm.processor1.checked) {
	document.mijnForm.processor1.value = "284";} else {document.mijnForm.processor1.value = "0"}
if (document.mijnForm.processor2.checked) {
	document.mijnForm.processor2.value = "483";} else {document.mijnForm.processor2.value = "0"}
if (document.mijnForm.processor3.checked) {
	document.mijnForm.processor3.value = "483";} else {document.mijnForm.processor3.value = "0"}
if (document.mijnForm.processor4.checked) {
	document.mijnForm.processor4.value = "783";} else {document.mijnForm.processor4.value = "0"}
if (document.mijnForm.processor5.checked) {
	document.mijnForm.processor5.value = "783";} else {document.mijnForm.processor5.value = "0"}
if (document.mijnForm.cpucooler1.checked) {
	document.mijnForm.cpucooler1.value = "62.50";} else {document.mijnForm.cpucooler1.value = "0"}
if (document.mijnForm.cpucooler2.checked) {
	document.mijnForm.cpucooler2.value = "112.50";} else {document.mijnForm.cpucooler2.value = "0"}
if (document.mijnForm.ventilator1.checked) {
	document.mijnForm.ventilator1.value = "99";} else {document.mijnForm.ventilator1.value = "0"}
if (document.mijnForm.ventilator2.checked) {
	document.mijnForm.ventilator2.value = "99";} else {document.mijnForm.ventilator2.value = "0"}
if (document.mijnForm.ventilator3.checked) {
	document.mijnForm.ventilator3.value = "99";} else {document.mijnForm.ventilator3.value = "0"}
if (document.mijnForm.ventilator4.checked) {
	document.mijnForm.ventilator4.value = "99";} else {document.mijnForm.ventilator4.value = "0"}
if (document.mijnForm.ventilator5.checked) {
	document.mijnForm.ventilator5.value = "0";} else {document.mijnForm.ventilator5.value = "0"}
if (document.mijnForm.fancontrol1.checked) {
	document.mijnForm.fancontrol1.value = "39";} else {document.mijnForm.fancontrol1.value = "0"}
if (document.mijnForm.fancontrol2.checked) {
	document.mijnForm.fancontrol2.value = "0";} else {document.mijnForm.fancontrol2.value = "0"}
if (document.mijnForm.moederbord1.checked) {
	document.mijnForm.moederbord1.value = "180";} else {document.mijnForm.moederbord1.value = "0"}
if (document.mijnForm.moederbord2.checked) {
	document.mijnForm.moederbord2.value = "180";} else {document.mijnForm.moederbord2.value = "0"}
if (document.mijnForm.moederbord3.checked) {
	document.mijnForm.moederbord3.value = "180";} else {document.mijnForm.moederbord3.value = "0"}
if (document.mijnForm.moederbord4.checked) {
	document.mijnForm.moederbord4.value = "244.80";} else {document.mijnForm.moederbord4.value = "0"}
if (document.mijnForm.ram1.checked) {
	document.mijnForm.ram1.value = "10";} else {document.mijnForm.ram1.value = "0"}
if (document.mijnForm.ram2.checked) {
	document.mijnForm.ram2.value = "10";} else {document.mijnForm.ram2.value = "0"}
if (document.mijnForm.ram3.checked) {
	document.mijnForm.ram3.value = "10";} else {document.mijnForm.ram3.value = "0"}
if (document.mijnForm.ram4.checked) {
	document.mijnForm.ram4.value = "10";} else {document.mijnForm.ram4.value = "0"}
if (document.mijnForm.ram5.checked) {
	document.mijnForm.ram5.value = "10";} else {document.mijnForm.ram5.value = "0"}
if (document.mijnForm.ram6.checked) {
	document.mijnForm.ram6.value = "10";} else {document.mijnForm.ram6.value = "0"}
if (document.mijnForm.ram7.checked) {
	document.mijnForm.ram7.value = "10";} else {document.mijnForm.ram7.value = "0"}
if (document.mijnForm.ram8.checked) {
	document.mijnForm.ram8.value = "10";} else {document.mijnForm.ram8.value = "0"}
if (document.mijnForm.ram9.checked) {
	document.mijnForm.ram9.value = "10";} else {document.mijnForm.ram9.value = "0"}
if (document.mijnForm.videokaart1.checked) {
	document.mijnForm.videokaart1.value = "10";} else {document.mijnForm.videokaart1.value = "0"}
if (document.mijnForm.videokaart2.checked) {
	document.mijnForm.videokaart2.value = "10";} else {document.mijnForm.videokaart2.value = "0"}
if (document.mijnForm.videokaart3.checked) {
	document.mijnForm.videokaart3.value = "10";} else {document.mijnForm.videokaart3.value = "0"}
if (document.mijnForm.videokaart4.checked) {
	document.mijnForm.videokaart4.value = "10";} else {document.mijnForm.videokaart4.value = "0"}
if (document.mijnForm.videokaart5.checked) {
	document.mijnForm.videokaart5.value = "10";} else {document.mijnForm.videokaart5.value = "0"}
if (document.mijnForm.ssd1.checked) {
	document.mijnForm.ssd1.value = "10";} else {document.mijnForm.ssd1.value = "0"}
if (document.mijnForm.ssd2.checked) {
	document.mijnForm.ssd2.value = "10";} else {document.mijnForm.ssd2.value = "0"}
if (document.mijnForm.ssd3.checked) {
	document.mijnForm.ssd3.value = "10";} else {document.mijnForm.ssd3.value = "0"}
if (document.mijnForm.ssd4.checked) {
	document.mijnForm.ssd4.value = "10";} else {document.mijnForm.ssd4.value = "0"}
if (document.mijnForm.ssd5.checked) {
	document.mijnForm.ssd5.value = "10";} else {document.mijnForm.ssd5.value = "0"}
if (document.mijnForm.ssd6.checked) {
	document.mijnForm.ssd6.value = "10";} else {document.mijnForm.ssd6.value = "0"}
if (document.mijnForm.2hdd1.checked) {
	document.mijnForm.2hdd1.value = "10";} else {document.mijnForm.2hdd1.value = "0"}
if (document.mijnForm.2hdd2.checked) {
	document.mijnForm.2hdd2.value = "10";} else {document.mijnForm.2hdd2.value = "0"}
if (document.mijnForm.2hdd3.checked) {
	document.mijnForm.2hdd3.value = "10";} else {document.mijnForm.2hdd3.value = "0"}
if (document.mijnForm.2hdd4.checked) {
	document.mijnForm.2hdd4.value = "10";} else {document.mijnForm.2hdd4.value = "0"}
if (document.mijnForm.3hdd1.checked) {
	document.mijnForm.3hdd2.value = "10";} else {document.mijnForm.3hdd1.value = "0"}
if (document.mijnForm.3hdd2.checked) {
	document.mijnForm.3hdd2.value = "10";} else {document.mijnForm.3hdd2.value = "0"}
if (document.mijnForm.3hdd3.checked) {
	document.mijnForm.3hdd3.value = "10";} else {document.mijnForm.3hdd3.value = "0"}
if (document.mijnForm.3hdd4.checked) {
	document.mijnForm.3hdd4.value = "10";} else {document.mijnForm.3hdd4.value = "0"}
if (document.mijnForm.3hdd5.checked) {
	document.mijnForm.3hdd5.value = "10";} else {document.mijnForm.3hdd5.value = "0"}	
if (document.mijnForm.4hdd1.checked) {
	document.mijnForm.4hdd1.value = "10";} else {document.mijnForm.4hdd1.value = "0"}
if (document.mijnForm.4hdd2.checked) {
	document.mijnForm.4hdd2.value = "10";} else {document.mijnForm.4hdd2.value = "0"}
if (document.mijnForm.4hdd3.checked) {
	document.mijnForm.4hdd3.value = "10";} else {document.mijnForm.4hdd3.value = "0"}
if (document.mijnForm.4hdd4.checked) {
	document.mijnForm.4hdd4.value = "10";} else {document.mijnForm.4hdd4.value = "0"}
if (document.mijnForm.4hdd5.checked) {
	document.mijnForm.4hdd5.value = "10";} else {document.mijnForm.4hdd5.value = "0"}
if (document.mijnForm.raid0.checked) {
	document.mijnForm.raid0.value = "10";} else {document.mijnForm.raid0.value = "0"}
if (document.mijnForm.raid1.checked) {
	document.mijnForm.raid1.value = "10";} else {document.mijnForm.raid1.value = "0"}
if (document.mijnForm.raid2.checked) {
	document.mijnForm.raid2.value = "10";} else {document.mijnForm.raid2.value = "0"}
if (document.mijnForm.1opticaldrive1.checked) {
	document.mijnForm.1opticaldrive1.value = "10";} else {document.mijnForm.1opticaldrive1.value = "0"}
if (document.mijnForm.1opticaldrive2.checked) {
	document.mijnForm.1opticaldrive2.value = "10";} else {document.mijnForm.1opticaldrive2.value = "0"}
if (document.mijnForm.2opticaldrive1.checked) {
	document.mijnForm.2opticaldrive1.value = "10";} else {document.mijnForm.2opticaldrive1.value = "0"}
if (document.mijnForm.2opticaldrive2.checked) {
	document.mijnForm.2opticaldrive2.value = "10";} else {document.mijnForm.2opticaldrive2.value = "0"}
if (document.mijnForm.2opticaldrive3.checked) {
	document.mijnForm.2opticaldrive3.value = "10";} else {document.mijnForm.2opticaldrive3.value = "0"}
if (document.mijnForm.2opticaldrive4.checked) {
	document.mijnForm.2opticaldrive4.value = "10";} else {document.mijnForm.2opticaldrive4.value = "0"}
if (document.mijnForm.cable1.checked) {
	document.mijnForm.cable1.value = "10";} else {document.mijnForm.cable1.value = "0"}
if (document.mijnForm.cable2.checked) {
	document.mijnForm.cable2.value = "10";} else {document.mijnForm.cable2.value = "0"}
if (document.mijnForm.cable3.checked) {
	document.mijnForm.cable3.value = "10";} else {document.mijnForm.cable3.value = "0"}
if (document.mijnForm.power1.checked) {
	document.mijnForm.power1.value = "10";} else {document.mijnForm.power1.value = "0"}
if (document.mijnForm.power2.checked) {
	document.mijnForm.power2.value = "10";} else {document.mijnForm.power2.value = "0"}
if (document.mijnForm.power3.checked) {
	document.mijnForm.power3.value = "10";} else {document.mijnForm.power3.value = "0"}
if (document.mijnForm.cable11.checked) {
	document.mijnForm.cable11.value = "10";} else {document.mijnForm.cable11.value = "0"}
if (document.mijnForm.cable12.checked) {
	document.mijnForm.cable12.value = "10";} else {document.mijnForm.cable12.value = "0"}
if (document.mijnForm.cable13.checked) {
	document.mijnForm.cable13.value = "10";} else {document.mijnForm.cable13.value = "0"}
if (document.mijnForm.cable14.checked) {
	document.mijnForm.cable14.value = "10";} else {document.mijnForm.cable14.value = "0"}
if (document.mijnForm.cable15.checked) {
	document.mijnForm.cable15.value = "10";} else {document.mijnForm.cable15.value = "0"}
if (document.mijnForm.sound1.checked) {
	document.mijnForm.sound1.value = "10";} else {document.mijnForm.sound1.value = "0"}
if (document.mijnForm.sound2.checked) {
	document.mijnForm.sound2.value = "10";} else {document.mijnForm.sound2.value = "0"}
if (document.mijnForm.sound3.checked) {
	document.mijnForm.sound3.value = "10";} else {document.mijnForm.sound3.value = "0"}
if (document.mijnForm.sound4.checked) {
	document.mijnForm.sound4.value = "10";} else {document.mijnForm.sound4.value = "0"}
if (document.mijnForm.sound5.checked) {
	document.mijnForm.sound5.value = "10";} else {document.mijnForm.sound5.value = "0"}
if (document.mijnForm.wifi1.checked) {
	document.mijnForm.wifi1.value = "10";} else {document.mijnForm.wifi1.value = "0"}
if (document.mijnForm.wifi2.checked) {
	document.mijnForm.wifi2.value = "10";} else {document.mijnForm.wifi2.value = "0"}
if (document.mijnForm.wifi3.checked) {
	document.mijnForm.wifi3.value = "10";} else {document.mijnForm.wifi3.value = "0"}
if (document.mijnForm.wifi4.checked) {
	document.mijnForm.wifi4.value = "10";} else {document.mijnForm.wifi4.value = "0"}
if (document.mijnForm.wifi5.checked) {
	document.mijnForm.wifi5.value = "10";} else {document.mijnForm.wifi5.value = "0"}
if (document.mijnForm.os1.checked) {
	document.mijnForm.os1.value = "10";} else {document.mijnForm.os1.value = "0"}
if (document.mijnForm.os2.checked) {
	document.mijnForm.os2.value = "10";} else {document.mijnForm.os2.value = "0"}
if (document.mijnForm.os3.checked) {
	document.mijnForm.os3.value = "10";} else {document.mijnForm.os3.value = "0"}
if (document.mijnForm.os4.checked) {
	document.mijnForm.os4.value = "10";} else {document.mijnForm.os4.value = "0"}
if (document.mijnForm.os5.checked) {
	document.mijnForm.os5.value = "10";} else {document.mijnForm.os5.value = "0"}
if (document.mijnForm.os6.checked) {
	document.mijnForm.os6.value = "10";} else {document.mijnForm.os6.value = "0"}
if (document.mijnForm.windowsoptimisation1.checked) {
	document.mijnForm.windowsoptimisation1.value = "10";} else {document.mijnForm.windowsoptimisation1.value = "0"}
if (document.mijnForm.windowsoptimisation2.checked) {
	document.mijnForm.windowsoptimisation2.value = "10";} else {document.mijnForm.windowsoptimisation2.value = "0"}
	
	
	
 var "totaal"= 
parseFloat(document.mijnForm.pckast1.value) + 
parseFloat(document.mijnForm.pckast2.value) + 
parseFloat(document.mijnForm.pckast3.value) + 
parseFloat(document.mijnForm.pckast4.value) + 
parseFloat(document.mijnForm.pckast5.value) + 
parseFloat(document.mijnForm.pckast6.value) + 
parseFloat(document.mijnForm.pckast7.value) + 
parseFloat(document.mijnForm.pckast8.value) + 
parseFloat(document.mijnForm.processor1.value) +
parseFloat(document.mijnForm.processor2.value) + 
parseFloat(document.mijnForm.processor3.value) + 
parseFloat(document.mijnForm.processor4.value) + 
parseFloat(document.mijnForm.processor5.value) + 
parseFloat(document.mijnForm.cpucooler1.value) + 
parseFloat(document.mijnForm.cpucooler2.value) + 
parseFloat(document.mijnForm.ventilator1.value) + 
parseFloat(document.mijnForm.ventilator2.value) + 
parseFloat(document.mijnForm.ventilator3.value) + 
parseFloat(document.mijnForm.ventilator4.value) + 
parseFloat(document.mijnForm.ventilator5.value) + 
parseFloat(document.mijnForm.fancontrol1.value) + 
parseFloat(document.mijnForm.fancontrol2.value) + 
parseFloat(document.mijnForm.moederbord1.value) + 
parseFloat(document.mijnForm.moederbord2.value) + 
parseFloat(document.mijnForm.moederbord3.value) + 
parseFloat(document.mijnForm.moederbord4.value) + 
parseFloat(document.mijnForm.ram1.value) + 
parseFloat(document.mijnForm.ram2.value) + 
parseFloat(document.mijnForm.ram3.value) + 
parseFloat(document.mijnForm.ram4.value) + 
parseFloat(document.mijnForm.ram5.value) + 
parseFloat(document.mijnForm.ram6.value) + 
parseFloat(document.mijnForm.ram7.value) + 
parseFloat(document.mijnForm.ram8.value) + 
parseFloat(document.mijnForm.ram9.value) + 
parseFloat(document.mijnForm.videokaart1.value) + 
parseFloat(document.mijnForm.videokaart2.value) + 
parseFloat(document.mijnForm.videokaart3.value) + 
parseFloat(document.mijnForm.videokaart4.value) + 
 parseFloat(document.mijnForm.videokaart5.value) + 
 parseFloat(document.mijnForm.ssd1.value) + 
 parseFloat(document.mijnForm.ssd2.value) + 
 parseFloat(document.mijnForm.ssd3.value) + 
 parseFloat(document.mijnForm.ssd4.value) + 
 parseFloat(document.mijnForm.ssd5.value) + 
 parseFloat(document.mijnForm.ssd6.value) + 
 parseFloat(document.mijnForm.2hdd1.value) + 
 parseFloat(document.mijnForm.2hdd2.value) + 
 parseFloat(document.mijnForm.2hdd3.value) + 
 parseFloat(document.mijnForm.2hdd4.value) + 
 parseFloat(document.mijnForm.3hdd1.value) + 
 parseFloat(document.mijnForm.3hdd2.value) + 
 parseFloat(document.mijnForm.3hdd3.value) + 
 parseFloat(document.mijnForm.3hdd4.value) + 
 parseFloat(document.mijnForm.3hdd5.value) + 
 parseFloat(document.mijnForm.4hdd1.value) + 
 parseFloat(document.mijnForm.4hdd2.value) + 
 parseFloat(document.mijnForm.4hdd3.value) + 
 parseFloat(document.mijnForm.4hdd4.value) + 
 parseFloat(document.mijnForm.4hdd5.value) + 
 parseFloat(document.mijnForm.raid0.value) + 
 parseFloat(document.mijnForm.raid1.value) + 
 parseFloat(document.mijnForm.raid2.value) + 
 parseFloat(document.mijnForm.1opticaldrive1.value) + 
 parseFloat(document.mijnForm.1opticaldrive2.value) + 
 parseFloat(document.mijnForm.2opticaldrive1.value) + 
 parseFloat(document.mijnForm.2opticaldrive2.value) + 
 parseFloat(document.mijnForm.2opticaldrive3.value) + 
 parseFloat(document.mijnForm.2opticaldrive4.value) + 
 parseFloat(document.mijnForm.cable1.value) + 
 parseFloat(document.mijnForm.cable2.value) + 
 parseFloat(document.mijnForm.cable3.value) + 
 parseFloat(document.mijnForm.power1.value) + 
 parseFloat(document.mijnForm.power2.value) + 
 parseFloat(document.mijnForm.power3.value) + 
 parseFloat(document.mijnForm.cable11.value) + 
 parseFloat(document.mijnForm.cable12.value) + 
 parseFloat(document.mijnForm.cable13.value) + 
 parseFloat(document.mijnForm.cable14.value) + 
 parseFloat(document.mijnForm.cable15.value) + 
 parseFloat(document.mijnForm.sound1.value) + 
 parseFloat(document.mijnForm.sound2.value) + 
 parseFloat(document.mijnForm.sound3.value) + 
 parseFloat(document.mijnForm.sound4.value) +  
 parseFloat(document.mijnForm.sound5.value) + 
 parseFloat(document.mijnForm.wifi1.value) + 
 parseFloat(document.mijnForm.wifi2.value) + 
 parseFloat(document.mijnForm.wifi3.value) + 
 parseFloat(document.mijnForm.wifi4.value) + 
 parseFloat(document.mijnForm.wifi5.value) + 
 parseFloat(document.mijnForm.os1.value) + 
 parseFloat(document.mijnForm.os2.value) + 
 parseFloat(document.mijnForm.os3.value) + 
 parseFloat(document.mijnForm.os4.value) + 
 parseFloat(document.mijnForm.os5.value) + 
 parseFloat(document.mijnForm.os6.value) + 
 parseFloat(document.mijnForm.windowsoptimisation1.value) + 
 parseFloat(document.mijnForm.windowsoptimisation2.value);
alert (totaal);
}	
</script>
</head>
<body>
<header>

	<br>
	<b>EPIC COMPUTERS</b>
</header>
<nav>
	<ul>
		<li><a href="Home2.html">Home</a></li>
		<li><a href="Computer2.html">Computers</a></li>
		<li><a href="About2.html">About</a></li>
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	</ul>
	<br>
</nav>
<br>
<section id="sidemenu">
	<ul>
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		<li><a href="pcbouwen.html">Bouw je eigen pc!</a></li>
	</ul>
</section>
<br>
<section id="bouwen1">
	<form name="mijnForm">
		<br>
		<h1>Bouw je eigen PC</h1>
		<br>
		<p>Klik op de gewenste onderdelen om deze te instaleren in jouw computer</p>
		<article>
		<input type="checkbox" id="pckast1"> 
		Corsair Carbide 300R Midi Tower Case
		<br>
		<br>
		<img src="pckast1.jpg"/>
		<br>
		<input type="checkbox" id="pckast2"> 
		Corsair Vengeance C70 Midi Tower Case - White
		<br>
		<br>
		<img src="pckast2.jpg"/>
		<br>
		<input type="checkbox" id="pckast3"> 
		Corsair Vengeance C70 Midi Tower Case - Black
		<br>
		<br>
		<img src="pckast3.jpg"/>
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		<input type="checkbox" id="pckast4"> 
		Corsair Vengeance C70 Midi Tower Case - Military Green
		<br>
		<br>
		<img src="pckast4.jpg"/>
		<br>
		<input type="checkbox" id="pckast5"> 
		Corsair Graphite 600T Midi Tower Case
		<br>
		<br>
		<img src="pckast5.jpg"/>
		<br>
		<input type="checkbox" id="pckast6"> 
		Corsair Graphite 600T Midi Tower Case in white
		<br>
		<br>
		<img src="pckast6.jpg"/>
		<br>
		<input type="checkbox" id="pckast7"> 
		<br>
		<img src="pckast7.jpg"/>
		Corsair Obsidian 650D Midi Tower Case
		<br>
		<br>
		<input type="checkbox" id="pckast8"/> 
		Corsair Obsidian 800D Full Tower Case
		<br>
		<br>
		<img src="pckast8.jpg">
		<br>
		<input type="checkbox" id="processor1"> 
		Intel Core i7 3820 4-cored Processor (Overclocked to up to 4.2GHz)
		<br>
		<br>
		<img src="processor.gif"/>
		<br>
		<input type="checkbox" id="processor2">
		Intel Core i7 3930K 6-cored Processor 3.2GHz (Overclocked to up to 4.7GHz)		
		<br>
		<br>
		<img src="processor.gif"/>
		<br>
		<input type="checkbox" id="processor3"> 
		Intel Core i7 3930K 6-cored Processor 3.2GHz (No Overclocking)
		<br>
		<br>
		<img src="processor.gif"/>
		<br>
		<input type="checkbox" id="processor4"> 
		Intel Core i7 3960X 6-cored Processor 3.3GHz (No Overclocking)
		<br>
		<br>
		<img src="processor.gif"/>
		<br>
		<input type="checkbox" id="processor5"> 
		Intel Core i7 3960X 6-cored Processor 3.3GHz (Overclocked to up to 4.5GHz)
		<br>
		<br>
		<img src="processor.gif"/>
		<br>
		<input type="checkbox" id="cpucooler1"> 
		<br>
		<img src="cpucooler1.png"/>
		<br>
		<input type="checkbox" id="cpucooler2"> 
		<br>
		<img src="cpucooler2.png"/>
		<br>
		<input type="checkbox" id="ventilator1"> 
		<br>
		<img src="ventilator1.png"/>
		<br>
		<input type="checkbox" id="ventilator2"> 
		<br>
		<img src="ventilator2.png"/>
		<br>
		<input type="checkbox" id="ventilator3"> 
		<br>
		<img src="ventilator3.png"/>
		<br>
		<input type="checkbox" id="ventilator4"> 
		<br>
		<img src="ventilator4.png"/>
		<br>
		<input type="checkbox" id="ventilator5"> 
		<br>
		<input type="checkbox" id="fancontrol1"> 
		<br>
		<img src="fancontrol.png"/>
		<br>
		<input type="checkbox" id="fancontrol2"> 
		<br>
		<input type="checkbox" id="moederbord1"> 
		<br>
		<img src="moederbord1.jpg"/>
		<br>
		<input type="checkbox" id="moederbord2"> 
		<br>
		<img src="moederbord2.jpg"/>
		<br>
		<input type="checkbox" id="moederbord3"> 
		<br>
		<img src="moederbord3.jpg"/>
		<br>
		<input type="checkbox" id="moederbord4"> 
		<br>
		<img src="moederbord4.gif"/>
		<br>
		<input type="checkbox" id="ram1"> 
		<br>
		<img src="ram1.png"/>
		<br>
		<input type="checkbox" id="ram2"> 
		<br>
		<img src="ram2.png"/>
		<br>
		<input type="checkbox" id="ram3"> 
		<br>
		<img src="ram3.png"/>
		<br>
		<input type="checkbox" id="ram4"> 
		<br>
		<img src="ram4.png"/>
		<br>
		<input type="checkbox" id="ram5"> 
		<br>
		<img src="ram5.png"/>
		<br>
		<input type="checkbox" id="ram6"> 
		<br>
		<img src="ram6.png"/>
		<br>
		<input type="checkbox" id="ram7"> 
		<br>
		<img src="ram7.png"/>
		<br>
		<input type="checkbox" id="ram8"> 
		<br>
		<img src="ram8.png"/>
		<br>
		<input type="checkbox" id="ram9"> 
		<br>
		<img src="ram9.png"/>
		<br>
		<input type="checkbox" id="videokaart1"> 
		<br>
		<img src="videokaart1.jpg"/>
		<br>
		<input type="checkbox" id="videokaart2"> 
		<br>
		<img src="videokaart2.jpg"/>
		<br>
		<input type="checkbox" id="videokaart3"> 
		<br>
		<img src="videokaart3.jpg"/>
		<br>
		<input type="checkbox" id="videokaart4"> 
		<br>
		<img src="videokaart4.jpg"/>
		<br>
		<input type="checkbox" id="videokaart5"> 
		<br>
		<img src="videokaart5.jpg"/>
		<br>
		<input type="checkbox" id="ssd1"> 
		<br>
		<img src="ssd1.jpg"/>
		<br>
		<input type="checkbox" id="ssd2"> 
		<br>
		<img src="ssd2.jpg"/>
		<br>
		<input type="checkbox" id="ssd3"> 
		<br>
		<img src="ssd3.jpg"/>
		<br>
		<input type="checkbox" id="ssd4"> 
		<br>
		<img src="ssd4.jpg"/>
		<br>
		<input type="checkbox" id="ssd5"> 
		<br>
		<img src="ssd5.png"/>
		<br>
		<input type="checkbox" id="ssd6"> 
		<br>
		<img src="ssd6.jpg"/>
		<br>
		<input type="checkbox" id="2hhd1"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="2hhd2"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="2hhd3"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="2hhd4"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="3hhd1"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="3hhd2"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="3hhd3"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="3hhd4"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="3hhd5"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="4hdd1"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="4hdd2"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="4hdd3"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="4hdd4"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="4hdd5"> 
		<br>
		<img src="hdd.png"/>
		<br>
		<input type="checkbox" id="raid0"> 
		<br>
		<img src="raid.jpg"/>
		<br>
		<input type="checkbox" id="raid1"> 
		<br>
		<img src="raid.jpg"/>
		<br>
		<input type="checkbox" id="raid2"> 
		<br>
		<input type="checkbox" id="1opticaldrive1"> 
		<br>
		<img src="opticaldrive1.gif"/>
		<br>
		<input type="checkbox" id="1opticaldrive2"> 
		<br>
		<img src="opticaldrive2.jpg"/>
		<br>
		<input type="checkbox" id="2opticaldrive1"> 
		<br>
		<img src="opticaldrive1.gif"/>
		<br>
		<input type="checkbox" id="2opticaldrive2"> 
		<br>
		<img src="opticaldrive2.jpg"/>
		<br>
		<input type="checkbox" id="2opticaldrive3"> 
		<br>
		<img src="opticaldrive3.jpg"/>
		<br>
		<input type="checkbox" id="2opticaldrive4"> 
		<br>
		<input type="checkbox" id="cable1"> 
		<br>
		<img src="cable1.jpg"/>
		<br>
		<input type="checkbox" id="cable2"> 
		<br>
		<img src="cable2.jpg"/>
		<br>
		<input type="checkbox" id="cable3"> 
		<br>
		<img src="cable3.jpg"/>
		<br>
		<input type="checkbox" id="power1"> 
		<br>
		<img src="power1.jpg"/>
		<br>
		<input type="checkbox" id="power2"> 
		<br>
		<img src="power2.png"/>
		<br>
		<input type="checkbox" id="power3"> 
		<br>
		<img src="power3.jpg"/>
		<br>
		<input type="checkbox" id="cable11"> 
		<br>
		<img src="cable11.png"/>
		<br>
		<input type="checkbox" id="cable12"> 
		<br>
		<img src="cable12.png"/>
		<br>
		<input type="checkbox" id="cable13"> 
		<br>
		<img src="cable13.png"/>
		<br>
		<input type="checkbox" id="cable14"> 
		<br>
		<img src="cable14.png"/>
		<br>
		<input type="checkbox" id="cable15"> 
		<br>
		<input type="checkbox" id="sound1"> 
		<br>
		<img src="sound1.jpg"/>
		<br>
		<input type="checkbox" id="sound2"> 
		<br>
		<img src="sound2.jpg"/>
		<br>
		<input type="checkbox" id="sound3"> 
		<br>
		<img src="sound3.png"/>
		<br>
		<input type="checkbox" id="sound4"> 
		<br>
		<img src="sound4.jpg"/>
		<br>
		<input type="checkbox" id="sound5"> 
		<br>
		<img src="sound5.jpg"/>
		<br>
		<input type="checkbox" id="wifi1"> 
		<br>
		<img src="wifi1.jpg"/>
		<br>
		<input type="checkbox" id="wifi2"> 
		<br>
		<img src="wifi2.jpg"/>
		<br>
		<input type="checkbox" id="wifi3"> 
		<br>
		<img src="wifi3.gif"/>
		<br>
		<input type="checkbox" id="wifi4"> 
		<br>
		<img src="wifi4.jpg"/>
		<br>
		<input type="checkbox" id="wifi5"> 
		<br>
		<br>
		<input type="checkbox" id="os1"> 
		<br>
		<img src=".os1jpg"/>
		<br>
		<input type="checkbox" id="os2"> 
		<br>
		<img src=".os2jpg"/>
		<br>
		<input type="checkbox" id="os3"> 
		<br>
		<img src=".os3jpg"/>
		<br>
		<input type="checkbox" id="os4"> 
		<br>
		<img src=".os4jpg"/>
		<br>
		<input type="checkbox" id="os5"> 
		<br>
		<img src=".os5jpg"/>
		<br>
		<input type="checkbox" id="os6"> 
		<br>
		<img src="os6.jpg"/>
		<br>
		<input type="checkbox" id="windowsoptimisation1"> 
		<br>
		<img src="windowsoptimisation.jpg"/>
		<br>
		<input type="checkbox" id="windowsoptimisation2"> 
		<br>
		
		<input type="button" value="Totaal" onClick="berekening();">
	</form>
</section>
</body>
</html>

The problem is this line in your code.

var [COLOR=#ff0000]"totaal"[/COLOR]=

You have double quotes wrapping the variable name which will cause a syntax error, it needs to be

var totaal =

Also your above code is quote verbose, you could easily cut a huge chunk of it out by re-factoring all your IF and parseFloat statements into array so only the field names are specified instead of all the code you currently have.