Need help with 2 level, drop down list

Hi There.

I’ve been reading this forum for quite sometime, but today is my first post, hope you guys can help.

Here is how the code works: (its like a phone directory)

-User first selects the dept.
-Once selected, a second drop down populates with the names of each person in that department.
-I want the contact info to show on the page once they select this last step.

I need for when the user selects this second options for a link to open inside a iFrame inside of the same html page.

I uploaded the file here for you to see: Total Financial -Contact Us

Here is the code for the HTML doc:

<body bgcolor="#ffffff" text="#000000" link="#0000ff" vlink="#800080" alink="#ff0000" onLoad="fillCategory();">

<FORM name="drop_list" action="yourpage.php" method="POST" >
		
<SELECT  NAME="Department" onChange="SelectSubCat();" >
<Option value="">Select Department</option>
</SELECT>&nbsp;
<SELECT id="SubCat" NAME="SubCat">
<Option value="">SubCat</option>
</SELECT>
</form>

Here is the .js file code

function fillCategory(){ 
 // this function is used to fill the category list on load
addOption(document.drop_list.Department, "Executive-Management", "Executive Management");
addOption(document.drop_list.Department, "Marketing", "Marketing", "");
addOption(document.drop_list.Department, "Annuities", "Annuities", "");
addOption(document.drop_list.Department, "Underwriting/Case Management", "Underwriting/Case Management", "");
addOption(document.drop_list.Department, "Human Resources", "Human Resources", "");
addOption(document.drop_list.Department, "Commissions", "Commissions", "");
addOption(document.drop_list.Department, "Policy Owner Services", "Policy Owner Services", "");
addOption(document.drop_list.Department, "Information Technology", "Information Technology", "");
addOption(document.drop_list.Department, "APS", "APS", "");
}



function SelectSubCat(){
// ON selection of category this function will work

removeAllOptions(document.drop_list.SubCat);
addOption(document.drop_list.SubCat, "", "SubCat", "");

if(document.drop_list.Department.value == 'Executive-Management'){
addOption(document.drop_list.SubCat,"MartyGreenberg", "Marty Greenberg - President");
addOption(document.drop_list.SubCat,"LisaGreenberg ", "Lisa Greenberg - Vice President");
addOption(document.drop_list.SubCat,"CraigBrown", "Craig Brown - CFO");
addOption(document.drop_list.SubCat,"RitaBogan", "Rita Bogan - Executive Secretary & Case Management");
addOption(document.drop_list.SubCat,"DianaGreenberg", "Diana Greenberg - Underwriting Manager");
}
if(document.drop_list.Department.value == 'Marketing'){
addOption(document.drop_list.SubCat,"RonBielefelt", "Ron Bielefelt - Chief Marketing Officer");
addOption(document.drop_list.SubCat,"PeterMilanez", "Peter Milanez - Brokerage Manager");
addOption(document.drop_list.SubCat,"MarkRBugli", "Mark R. Bugli - CLU, ChFC ");
addOption(document.drop_list.SubCat,"HowardMandel", "Howard Mandel - Director of Business Development");
addOption(document.drop_list.SubCat,"DeborahSanchez", "Deborah Sanchez - Brokerage Supervisor ");
addOption(document.drop_list.SubCat,"SylviaMariscal", "Sylvia Mariscal - Life Settlements");
addOption(document.drop_list.SubCat,"PeterMilanez", "Peter Milanez - Brokerage Manager");
addOption(document.drop_list.SubCat,"JosephTanner", "Joseph Tanner - Brokerage Manager Assistant", "");
}
if(document.drop_list.Department.value == 'Annuities'){
addOption(document.drop_list.SubCat,"SethMoses", "Seth Moses - Director of Annuities");
addOption(document.drop_list.SubCat,"SteveAvila", "Steve Avila - Assistant to Seth Moses");
}
if(document.drop_list.Department.value == 'Underwriting/Case Management'){
addOption(document.drop_list.SubCat,"DianaGreenberg", "Diana Greenberg - Underwriting Manager");
addOption(document.drop_list.SubCat,"KimberlyFleming", "Kimberly Fleming - Case Manager ");
addOption(document.drop_list.SubCat,"LarissaBurton", "Larissa Burton - Case Manager Assistant to Kimberly Fleming");
addOption(document.drop_list.SubCat,"MariaAntebi", "Maria Antebi - Case Manager");
addOption(document.drop_list.SubCat,"LilianaGalvan", "Liliana Galvan - Case Manager");
addOption(document.drop_list.SubCat,"KimberlyKoontz", "Kimberly Koontz  - Case Manager Assistant to Liliana Galvan");
addOption(document.drop_list.SubCat,"ChastaSpikes", "Chasta Spikes  - Case Manager");
addOption(document.drop_list.SubCat,"SylviaMarsicalShank", "Sylvia Marsical-Shank - Case Manager");
addOption(document.drop_list.SubCat,"TriciaRomain  ", "Tricia Romain - Case Manager");
addOption(document.drop_list.SubCat,"BetoRuiz", "Beto Ruiz  - Case Manager");
addOption(document.drop_list.SubCat,"DavidGarcia", "David Garcia - Case Manager Assistant");
}
if(document.drop_list.Department.value == 'Human Resources'){
addOption(document.drop_list.SubCat,"MarieOkamura", "Marie Okamura - Human Resources Director");
}
if(document.drop_list.Department.value == 'Commissions'){
addOption(document.drop_list.SubCat,"WalterHelbig", "Walter Helbig, FLMI - Licensing");
addOption(document.drop_list.SubCat,"KenFong", "Ken Fong - Licensing");
addOption(document.drop_list.SubCat,"JimTigrak", "Jim Tigrak - Commissions");
}
if(document.drop_list.Department.value == 'Licensing'){
addOption(document.drop_list.SubCat,"TessSlezak ", "Tess Slezak - Licensing");
addOption(document.drop_list.SubCat,"ArleneAuerhan ", "ArleneAuerhan  - Licensing");
addOption(document.drop_list.SubCat,"JimTigrak", "Jim Tigrak - Forms & Supplies");
}
if(document.drop_list.Department.value == 'Policy Owner Services'){
addOption(document.drop_list.SubCat,"LanTran", "Lan Tran - Policy Services");
addOption(document.drop_list.SubCat,"GianSanchez ", "Gian Sanchez - Receptionist");
addOption(document.drop_list.SubCat,"ArmonTodd ", "Armon Todd - Office Support");
}
if(document.drop_list.Department.value == 'Information Technology'){
addOption(document.drop_list.SubCat,"HenryCholakyan ", "Henry Cholakyan - IT Director");
}
if(document.drop_list.Department.value == 'APS'){
addOption(document.drop_list.SubCat,"CarmenAllen  ", "Carmen Allen - APS Supervisor");
}
}
////////////////// 

function removeAllOptions(selectbox)
{
	var i;
	for(i=selectbox.options.length-1;i>=0;i--)
	{
		//selectbox.options.remove(i);
		selectbox.remove(i);
	}
}


function addOption(selectbox, value, text )
{
	var optn = document.createElement("OPTION");
	optn.text = text;
	optn.value = value;

	selectbox.options.add(optn);
}

Thanks for any help in advanced!