Positioning problems

I’ve having trouble with a disjointed CSS rollover.
I don’t know if it’s the rollover causing the problem (I don’t think so) but if you compare these pages You’ll see what I mean.

Crusader Sergeants – Mercenaries
Mercenary Spearmen – Mercenaries
Viking Mercenaries – Mercenaries

If you scroll to the bottom of each page, you’ll see what I mean. On the first page, there’s a huge space between the content and the bottom of the page. The second is a narrower gap and the last has no gap.
The gap seems to be related to the list of items to the left of the image (ul#navlist), but no matter what I try, it has no effect. I tried to increase the height of the containing block (<div id=“defaultImage”>) but this just throws the rollover out of whack.
What could I do to make everything uniform regardless of the number of listed items?


body {
	font-family: Arial,sans-serif;
	color: #000;
	margin: 0px;
	padding: 0px;
	background: #fff url(../images/bg_grad.jpg) fixed;
}

hr { margin-bottom: 2px; color:#000; }


ul, li { list-style: none; padding: 0; margin: 0; }

H2 { margin: 5px 0 5px 0; }

img {
vertical-align: bottom; /*to remove gap under images if left inline*/
border: 0;
padding: 0;
}

span { margin: 0; padding: 0;}

a { text-decoration: none; }


/********* form and related tag styles *********/

form { position: absolute; left: 680px; top: 115px;}


label{
 font: bold 1em Arial,sans-serif;
 color: #334d55;
}
				
input{
font-family: Arial,sans-serif;
}

/***********************************************/
/* Layout Divs                                 */
/***********************************************/
#pagecell1{
	position:absolute;
	top: 145px;
	left: 2%;
	right: 2%;
	width:95.6%;
	background-color: #ffffff;
	border: 2px solid #000;
		
}

#masthead{
	position: absolute;
	top: 0px;
	left: 2%;
	right: 2%;
	width:95.6%;
		
}

#masthead img { padding-right: 20px; display: inline;}

#pageNav {
	float: left;
	width:178px;
	padding: 0px;
	background-color: #fff;
	border-right: 1px solid #000;
	font: small Verdana,sans-serif;
}

#content{
	padding: 0;
	margin: 0px 0px 0px 178px;
	border-left: 1px solid #000;
}





/************** feature styles *****************/

.feature {
	padding: 0px 0px 50px 10px;
	display: block;
	}

.feature img {
	float: left;
	padding: 10px 30px 25px 30px;
	width: 432px;
	height: 172px;
}


.feature img.tall {
	float: left;
	padding: 10px 30px 10px 30px;
	width: 191px;
	height: 280px;
}

/*
.feature_tall { padding: 0px 0px 60px 10px; }
.feature_tall img { 
    float: left;
	padding: 10px 30px 10px 30px;
	width: 191px;
	height: 280px;
	}
*/


.feature p { font: bold 72%/1.3em Arial, Helvetica, sans-serif;
             padding: 0px;
			 margin: 0;
			 } 
.feature p.top_space { margin-top: 5px; }			 




/*************** story styles ******************/

.story {
	padding: 10px 5px 0px 10px;
	}

.story p { font: 1em/1.3em Arial, Helvetica, sans-serif; }
	


.story img { padding-right: 8px; margin-left: 2px; border: none; float: left; }


/************** siteInfo styles ****************/

#siteInfo{
	clear: both;
	border-top: 1px solid #cccccc;
	padding: 10px 10px 10px 10px;
	margin-top: 0px;
}

#siteInfo a { font-size: small;	color: #000; }
#siteInfo a:hover { color: #FF0000; }

#footer {	
	margin: 10px 0 10px 20px;
	padding-top: 10px;
	text-align: center;
	}
	
#footer a { font: 14px geneva, verdana, arial, helvetica, sans-serif; color: #000; }
	
#footer a:hover { color:#FF0000; }	

/************ sectionLinks styles **************/

#sectionLinks {
	margin: 0px;
	padding: 0px;

}

#sectionLinks a:link, #sectionLinks a:visited {
	display: block;
	border-top: 0px solid #000;
	border-bottom: 1px solid #000;
	background-color: #f6d478;
	font-weight: bold;
	padding: 3px 0px 3px 10px;
	color: #000;
}

#sectionLinks a:hover{
	color: #00CCFF;
	background-color: #f6d478; 
	background-image: none;
	font-weight: bold;
	text-decoration: none;
}

/************ sectionLinks styles Moors Link **************/

#sectionLinks.doa {
	margin: 0px;
	padding: 0px;
	

}

a.doa  { text-align: center; }
a.doa p { margin: 0 0 0 -25px;}

/**************** advert styles *****************/

#advert {
    float: left;
	margin: 10px auto;
	width: 180px;
	text-align: center;
	font-size: 2em;
	
}

#advert img {
	border: none;
}

#advert a { border: none; }

/* Unit Type Hovers */

 a.ut { position: relative; text-decoration: underline; color: #000; border-bottom: 1px double #000; }
 a.ut span { display: none; }	
 a.ut:hover span { display: block; position: absolute; top: 2em; left: -2em; padding: 2px; border: 1px double #000; color: #000; background-color:#D5C2A2; width: 23em; } 
 
 
/********************* Mercenary Units ******************************/

p#merc_comm  { font-size: .9em; font-style: italic; width: 80%; text-align: center; }


#navlist {
padding: 0 1px 1px;
margin-left: 0;
margin-bottom: 0;
font: bold 12px Verdana, sans-serif;
height: 300px;
float: left;
position: relative;
top: 0px;
left: -5px;
width: 160px;
 }
 
 #navlist h2 { color: #fff; }



#navlist li {
list-style: none;
margin: 3px 0 0 10px;
display: block;
position: relative;
top: 0px;
left: 3px;
width: 156px;
text-align: center;
font-style: italic;
}

#navlist li a {
font: bold 1.1em/1.4em Arial, Helvetica, sans-serif;
background: #fff;
text-decoration: none;
 }

#navlist li a:link { color: #000; }
#navlist li a:visited { color: #000; }
#navlist li a:hover {
	color: #ff0000;
	visibility: visible; }

#navlist li a span {
visibility:hidden;
display:block;
position: absolute;
color:#000;
width: 411px;
height: 250px;
}



#defaultImage {
visibility:visible;
display:block;
position: absolute;
margin: 0 0 0 200px;
width: 411px;
height: 250px;
background-image:url(../Mercs/images/regions/base.jpg) ;
}



#navlist li a:hover span {
	visibility:visible;
    background-image:url(../Mercs/images/regions/rollover_16_BIG.png) ;
    top: -20px; left: 191px;
	display: block;
	}



#navlist li a:hover span#scot { background-position: 0 0; }
#navlist li a:hover span#ire  { background-position: 0 -250px;   }
#navlist li a:hover span#wales { background-position: 0 -500px;   }
#navlist li a:hover span#n_germany { background-position: 0 -750px; }
#navlist li a:hover span#s_germany { background-position: 0 -1000px; }
#navlist li a:hover span#n_italy { background-position: 0 -1250px;  }
#navlist li a:hover span#switz { background-position: 0 -1500px;  }
#navlist li a:hover span#pyrenaes { background-position: -411px 0; }
#navlist li a:hover span#e_balkans { background-position: -411px -250px; }
#navlist li a:hover span#e_greece { background-position: -411px -500px; }
#navlist li a:hover span#anatolia { background-position: -411px -750px; }
#navlist li a:hover span#levant { background-position: -411px -1000px; }
#navlist li a:hover span#armenia{ background-position: -411px -1250px; }
#navlist li a:hover span#w_greece { background-position: -411px -1500px; }
#navlist li a:hover span#w_balkans { background-position: -822px 0; }
#navlist li a:hover span#burgundy { background-position: -822px -250px; }
#navlist li a:hover span#sardinia { background-position: -822px -500px; }
#navlist li a:hover span#france { background-position: -822px -750px; }
#navlist li a:hover span#steppes { background-position: -822px -1000px; }
#navlist li a:hover span#se_steppes { background-position: -822px -1250px; }
#navlist li a:hover span#sicily { background-position: -822px -1500px; }
#navlist li a:hover span#n_africa { background-position: -1233px 0; }
#navlist li a:hover span#ne_africa { background-position: -1233px -250px; }
#navlist li a:hover span#nubia { background-position: -1233px -500px; }
#navlist li a:hover span#egypt { background-position: -1233px -750px; }
#navlist li a:hover span#spain { background-position: -1233px -1000px; }
#navlist li a:hover span#scan { background-position: -1233px -1250px; }
#navlist li a:hover span#norway { background-position: -1233px -1500px; }

Each page looks the same to me in Firefox. What browser are you viewing this in?

Firefox.
Did you scroll to the bottom?
I just looked at it in Explorer here at work and it’s doing the same thing.

I have a big screen, so no need for scrolling.