Please Help with scripting action menus!

I am trying to create populating dropdown menus with the populated menu linking to a URL on my site, but now sure where to put the code for the URL GoTo action, Javascript is now my thing and would appreciate some help!!

My Code looks like this:
[COLOR=”Red”](e.g. when City33 is selected, I would like the URL to be fetched)[/COLOR]

<script language=javascript>
var aa = new Array(“state1″,”state2″,”state3”);
state1 = new Array(“city1″,”city2”);
state2 = new Array(“city21″,”city22″,”city23”);
state3 = new Array(“city31″,”city32″,”city33”);

function changeval()
{
var val1 = document.sform.sel1.value;
var optionArray = eval(val1);
for(var df=0; df<optionArray.length; df++)
{
var ss = document.sform.sel2;
ss.options.length = 0;
for(var ff=0; ff<optionArray.length; ff++)
{
var val = optionArray[ff];
ss.options[ff] = new Option(val,val);
}
}
}
</script>

<form name=sform>
<select name=sel1 onchange=changeval()>
<script language=javascript>
for(var dd=0; dd<aa.length; dd++)
{
document.write(“<option value=””+aa[dd]+””>”+aa[dd]+”</option>”);
}
</script>
</select>

<select name=sel2>
</select>

</form>

Also in #JavaScript _↴