http://www.mtv.it/tv/programmi/trl/vota.asp
http://www.mtv.it/tv/programmi/trl/inserisci_vota.asp?gia_votato=ok

<script language="JavaScript">
<!--
var gia_votato = 0;
function vota(id){
	if (gia_votato == 0){
		document.form_vota.ID.value = id;
		gia_votato = 1;
		document.form_vota.submit();
	}
	else{
		document.form_vota.ID.value = '';
		document.form_vota.submit();
	}
}
//-->
</script>

<form name="form_vota" method="post" action="inserisci_vota.asp">
<input type="hidden" name="ID" value="">
</form>