codice:
<script>
function Log(){
var user = document.getElementById("user").value;
var psw = document.getElementById("psw").value;
if(user!="" && psw!=""){
document.modulo.action=tutodominio/user+psw;
document.modulo.submit();
}else{alert("compila user e password"); return false;}
}
</script>
<form method="get" action = "" name="modulo" onsubmit="Log()"> campi form psw e user tasto tipo submit</form>