dove sbaglio? tnx

codice:
<script type="text/javascript">
function roma(){
     <select name="select" size="5" id="romacap">
     <option>00119</option>
     <option>00120</option>
     </select>
     }
citta = 'roma';
if (citta == 'roma'){
     document.onload = roma();
     }		
</script>