Index: simple_grid.js
===================================================================
--- simple_grid.js	(revision 13571)
+++ simple_grid.js	(working copy)
@@ -67,30 +67,25 @@
 	return document.getElementById($prepend + this.FieldMask.replace('#FIELD#', $field_name).replace('#ID#', $id) + $append);
 }
 
-SimpleGrid.prototype.markError = function ($item_id, $field_name, $error_found) {
+SimpleGrid.prototype.markError = function ($item_id, $field_name, $error_found, $error_message) {
 	if (!isset($error_found)) {
 		$error_found = true;
 	}
 
-	var $field = this.getField($item_id, $field_name);
+	var $field = $( this.getField($item_id, $field_name) );
+
 	if ($error_found) {
-		$field.style.backgroundColor = '#EF2C2C';
+		$field.css('background-color', '#EF2C2C').attr('title', $error_message === undefined ? '' : $error_message)
 
 		// TODO: duplicate focus events possible on one element, fix this later
-		addEvent($field, 'focus',
+		.focus(
 			function($e) {
-				if (!$e) {
-					$e = window.event;
-				}
-
-      			var $element = document.all ? $e.srcElement : $e.currentTarget;
-				$element.style.backgroundColor = '';
+				$(this).css('background-color', '').attr('title', '');
 			}
-
 		);
 	}
 	else {
-		$field.style.backgroundColor = '';
+		$field.css('background-color', '').attr('title', '');
 	}
 }