<script language=javascript>
function go(mm)
{
if(mm=="asdf")
window.open("1.jsp");
if(mm=="werwer")
window.open("2.jsp");
}
</script>
<select name=aa onchange="go(aa.value)">
<option value="asdf">1</option>
<option value="werwer">2</option>
</select>
function go(mm)
{
if(mm=="asdf")
window.open("1.jsp");
if(mm=="werwer")
window.open("2.jsp");
}
</script>
<select name=aa onchange="go(aa.value)">
<option value="asdf">1</option>
<option value="werwer">2</option>
</select>
<form name="myForm">
<select name=aa onchange="myForm.submit()">
.......
</select>
</form>
<form name="myForm" action="your.jsp">
<select name=aa onchange="myForm.submit()">
.......
</select>
</form>
还是用javascript吧:)