function checkrequired(which){
   var pass=true
   if (document.images){
   for (i=0;i<which.length;i++){
    var tempobj=which.elements[i]
    if (tempobj.name.substring(0,8)=="required"){
    if (((tempobj.type=="text"||tempobj.type=="textarea")&&tempobj.value=='')||(tempobj.type.toString().charAt(0)=="s"&&tempobj.selectedIndex==-1)){
    pass=false
    break
    }}
    }
}
if (!pass){
   alert("Attenzione: i campi sono obbligatori - Please attention: the field must be filled in")
   return false
}
else
    return true
}