function checkform ( form1 )

{
   
  // ** START **
  if (form1.LAST_NAME.value == "") {
    alert( "Please enter your Last Name." );
    form1.LAST_NAME.focus();
    return false ;
  }
  if (form1.FIRST_NAME.value == "") {
    alert( "Please enter your First Name." );
    form1.FIRST_NAME.focus();
    return false ;
  }
  if (form1.LINK_UP.value == "") {
    alert( "Please enter your search informations" );
    form1.LINK_UP.focus();
    return false ;
  }
  if (form1.LINK_UP.value.length < 20 ) {
    alert( "Your search should be between 20 and 500 Characters  " );
    form1.LINK_UP.focus();
    return false ;
  }
    
   // ** END **
  return true ;
}