Drop Down List Value Returned On Submit Button Being Clicked?

I have a drop down selection box with items in it. I need to be able to pass the selected item through using an onclick event for the "Submit" button. Is this possible?

I have a Javascript that is calling a div to popup. This div is the drop down selector. I want the user to click a button to make the drop down appear, then they must select an item in the list and then hit submit. The submit button being clicked I need to bring in the selected value from the drop down and use it in the script that originally told the div to pop up (this is the first button that the user clicks, it actually runs the script which passes 2 variables, and is basically waiting on the drop down selection to save into a 3rd variable, which will then call a PageMethod).

I have

function AddTemplateToUUT(uutnumber,testerid){
var templatename=SelectTemplateToAssign();
PageMethods.AddTemplateToUUT(testerid,uutnumber,templatename,CallbackDiv,CallbackErrorAlert,'divchecklistarea');
ShowSelection('divtemplateblock','hide');

[Code]....