javascript and drop down form

hey all,
i'm trying to pass the option values of the drop down form element 
using the onChange event, however, havent a little trouble doing so.
can anyone shed some light? here's what i have so far:

<SCRIPT LANGUAGE="JavaScript">
<!-- dropdown submit for Mainsilos
function formHandler(){
var URL = document.MainSilos;
window.location.href = URL;
// End -->
}
</SCRIPT>

<select name="MainSilos" onChange="formHandler()">
<option value="" selected>--</option>
<option value="1">Music</option>
<option value="2">Culture</option>
<option value="3">Politics</option>
</select>

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