<script language="JavaScript"> 
<!-- 
function go(){
 k = document.selecter.url.selectedIndex;
 url = document.selecter.url.options[k].value;
 
 if (url != "") { 
  location.href = url;
 }
}
//-->
</script>

<form name="selecter">
  <select name="url" size=1>
    <option value="">Select your destination...</option>
    <option value="">--------------------</option>
    <option value="url.html">Home Page</option>
    <option value="url/url.html">Your URL</option>
  </select>
<INPUT TYPE="button" VALUE="Go" onclick="go()">
</form>