Here is something that I found online...not sure how well it will work, but it is worth a shot
Code:
<script type="text/javascript">
var selectmenu=document.getElementById("mymenu")
selectmenu.onchange=function(){
var chosenoption=this.options[this.selectedIndex]
if (chosenoption.value!="nothing"){
window.location = chosenoption.value
}
}
</script>
<form id="aform">
<select id="mymenu" size="1">
<option value="nothing" selected="selected">Select a site</option>
<option value="http://www.dynamicdrive.com">Dynamic Drive</option>
<option value="http://www.codingforums.com">Coding Forums</option>
<option value="http://www.cssdrive.com">CSS Drive</option>
</select>
</form>
that is worth a shot...i haven't tried it