function validate_field(id1)
{
if (document.getElementById(id1).value=='')
return 0;
else
return 1;
}

function display_error (id1,id2,id3,error_subj,ok_subj)
{

 if(validate_field(id3))
 {
  document.getElementById(id1).innerHTML=ok_subj;
  clear_focus(id1,id2);
  return true;
 }
 else
 {
   document.getElementById(id1).innerHTML=error_subj;
   document.getElementById(id1).className="info_error";
   document.getElementById(id2).className="fields_error";
   return false;
 }

}

function show_error (id1,id2,error_subj)
{
   document.getElementById(id1).innerHTML=error_subj;
   document.getElementById(id1).className="info_error";
   document.getElementById(id2).className="fields_error";
   return false;
}

function clear_focus(id1,id2)
{
if(id1!='')
document.getElementById(id1).className="info";
document.getElementById(id2).className="fields";
return 0;
}

function set_focus(id1,id2)
{
if(id1!='')
document.getElementById(id1).className="info_focus";
document.getElementById(id2).className="fields_focus";
return 0;
}