function lcheckform ( what ) {
  var errors = "";
  $(".mand",what).each(function(i) {
			 //			 errors += $(this).val() + "<br>";
			 if ( $(this).val() == "" ) {
			   $(this).css("background-color","#FF6600");
			   errors = "Fehler: Feld(er) nicht ausgefüllt!\n";
			 } else {
			   $(this).css("background-color","#ffffff");
			 }
		       });
  if ( errors != "" ) {
    alert ( errors );
    return false;
  } else return true;
}