function checkrequired_pass(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.type=="password")&& tempobj.value=='')||(tempobj.type.toString().charAt(0)=="s"&&tempobj.selectedIndex==-1))
  {
    pass=false
    break
  }
}
}
}
if (!pass){
alert("E' necessario inserira una USERNAME e una PASSWORD per accedere!")
return false
}
else
return true
}