<!--
function valid_fields(frm){

  if(isEmpty(frm.nome))
   { alert("Error: il tuo nome / Your email"); return false;}

  if(frm.tuaemail.value.indexOf('@')==-1)
   { alert("Error: Tua email / Your email"); return false;}

  if(frm.emaildest.value.indexOf('@')==-1)
   { alert("Error: email dest"); return false;}
 
 frm.invio.disabled = true;
 return true;
}

function isEmpty(field){
for(var i=0; i<field.value.length; i++)
 {
   c = field.value.charCodeAt(i);
   if(c != 32){return false;}  
 }
return true;
}
// -->