non mi funziona

<select name="coll" class="selectheader">
<option value="myarea.phtml">Scegli...</option>
<option value="1">my area</option>
<option value="2">area magazine</option>
<option value="3">personal site</option>
<option value="4">fan club</option>
<option value="5">nutella art</option>
<option value="6">area iscrizione</option>
<option value="7">my bacheca</option>
<option value="8">nutellaro</option>
<option value="9">cartoline</option>
<option value="10">my contact</option>
</select>
<input type="image" border="0" name="Submit" src="img/vai_header.gif" width="40" height="19" align="middle" onclick="location.href = coll.options[coll.selectedIndex].value;">