Index: grid_scroller.js
===================================================================
--- grid_scroller.js	(revision 13861)
+++ grid_scroller.js	(working copy)
@@ -297,34 +297,27 @@
 	} else {
 		$status = window.addEventListener('resize', function(ev) { the_grid.AutoResize() }, true);
 	}
-	if (document.all) {
-		this.DataScroller.onmousewheel = function(ev) {
+
+	// set mouse scroll events
+	this.setMouseScroll(
+		this.DataScroller,
+		function(ev) {
 			var e = document.all ? window.event : ev;
-			this.TheGrid.MainInner.scrollTop += -e.wheelDelta/2
-			this.TheGrid.SyncScroll();
+			the_grid.MainInner.scrollTop += (e.detail ? e.detail * 10 : -e.wheelDelta / 2);
+			the_grid.SyncScroll();
 		}
-		if (this.LeftCells > 0) {
-			this.LeftDataInner.onmousewheel = function(ev) {
+	);
+
+	if (this.LeftCells > 0) {
+		this.setMouseScroll(
+			this.LeftDataInner,
+			function(ev) {
 				var e = document.all ? window.event : ev;
-				this.TheGrid.MainInner.scrollTop += -e.wheelDelta/2
-				this.TheGrid.SyncScroll();
+				the_grid.MainInner.scrollTop += (e.detail ? e.detail * 10 : -e.wheelDelta / 2);
+				the_grid.SyncScroll();
 			}
-		}
+		);
 	}
-	else {
-		this.DataScroller.addEventListener("DOMMouseScroll", function(ev) {
-			var e = document.all ? window.event : ev;
-			this.TheGrid.MainInner.scrollTop += e.detail*10
-			this.TheGrid.SyncScroll();
-		}, false);
-		if (this.LeftCells > 0) {
-			this.LeftDataInner.addEventListener("DOMMouseScroll", function(ev) {
-				var e = document.all ? window.event : ev;
-				this.TheGrid.MainInner.scrollTop += e.detail*10
-				this.TheGrid.SyncScroll();
-			}, false);
-		}
-	}
 
 	addLoadEvent(
 		function() {
@@ -335,6 +328,16 @@
 	);
 }
 
+GridScroller.prototype.setMouseScroll = function ($element, $callback) {
+	if ($element.addEventListener) {
+		$element.addEventListener('DOMMouseScroll', $callback, false);
+		$element.addEventListener('mousewheel', $callback, false); // needed?
+	}
+	else if ($element.attachEvent) {
+    	$element.attachEvent('onmousewheel', $callback);
+	}
+}
+
 GridScroller.prototype.SetReferences = function() {
 	this.MainOuter = document.getElementById('outer_main_'+this.GridId );
 	this.MainInner = document.getElementById('inner_main_'+this.GridId)