diff --git a/treegrid.js b/treegrid.js
index 80f0cca..9a925a1 100644
--- a/treegrid.js
+++ b/treegrid.js
@@ -87,6 +87,7 @@ TreeGrid.prototype.initCellEditing = function(onStartEdit, onStopEdit)
     self.editedCells = []; // FIXME maybe remove and use just class selector
     addListener(this.table, 'dblclick', function(evt)
     {
+        evt = evt||window.event;
         var td = evt.target||evt.srcElement;
         while (td.nodeName != 'TABLE' && td.nodeName != 'TD')
             td = td.parentNode;
diff --git a/treegridtest.htm b/treegridtest.htm
index 93f0ae8..03ab72b 100644
--- a/treegridtest.htm
+++ b/treegridtest.htm
@@ -51,10 +51,13 @@ onDomReady(function()
 
     // Cell selection by mouse drag example
     var startDrag, dragDiv;
-    $(document.body).on('mousedown', function(evt)
+    addListener(document.body, 'mousedown', function(evt)
     {
-        $(TG.table).find('td.selected').removeClass('selected');
-        if (evt.button != 0)
+        var els = TG.table.querySelectorAll('td.selected');
+        for (var i = 0; i < els.length; i++)
+            els[i].className = els[i].className.replace(' selected', '');
+        evt = getEventCoord(evt);
+        if (evt.which != 1)
             return;
         startDrag = [ evt.pageX, evt.pageY ];
         if (!dragDiv)
@@ -64,10 +67,11 @@ onDomReady(function()
             document.body.appendChild(dragDiv);
         }
     });
-    $(document.body).on('mousemove', function(evt)
+    addListener(document.body, 'mousemove', function(evt)
     {
         if (startDrag)
         {
+            evt = getEventCoord(evt);
             dragDiv.style.display = 'block';
             if (startDrag[0] < evt.pageX)
             {
@@ -91,10 +95,11 @@ onDomReady(function()
             }
         }
     });
-    $(document.body).on('mouseup', function(evt)
+    addListener(document.body, 'mouseup', function(evt)
     {
         if (startDrag)
         {
+            evt = getEventCoord(evt);
             dragDiv.style.display = 'none';
             var x1 = startDrag[0], y1 = startDrag[1], x2 = evt.pageX, y2 = evt.pageY;
             if (x2 < x1)
@@ -112,30 +117,29 @@ onDomReady(function()
             startDrag = null;
             if (x2 > x1+10 && y2 > y1+10)
             {
-                $(rectangleSelect($(TG.table).find('td + td'), x1, y1, x2, y2)).addClass('selected');
+                rectangleSelect(TG.table.getElementsByTagName('td'), x1, y1, x2, y2, function()
+                {
+                    var e = this.previousSibling;
+                    while (e && e.nodeType == 3) e = e.previousSibling;
+                    if (e)
+                        this.className += ' selected';
+                });
                 return false;
             }
         }
     });
 });
 
-function rectangleSelect(selector, x1, y1, x2, y2)
+function rectangleSelect(elements, x1, y1, x2, y2, cb)
 {
-    var elements = [];
-    $(selector).each(function()
+    for (var i = 0; i < elements.length; i++)
     {
-        var $this = $(this);
-        var offset = $this.offset();
-        var x = offset.left;
-        var y = offset.top;
-        var w = $this.width();
-        var h = $this.height();
-        if (x+w >= x1 && y+h >= y1 && x <= x2 && y <= y2)
-        {
-            elements.push($this.get(0));
-        }
-    });
-    return elements;
+        var offset = getOffset(elements[i]);
+        var w = elements[i].offsetWidth;
+        var h = elements[i].offsetHeight;
+        if (offset.left+w >= x1 && offset.top+h >= y1 && offset.left <= x2 && offset.top <= y2)
+            cb.apply(elements[i]);
+    }
 }
 //-->
 </script>
diff --git a/util.js b/util.js
index d90ff88..395e69f 100644
--- a/util.js
+++ b/util.js
@@ -251,6 +251,26 @@ window.getOffset = function(elem)
 		return getOffsetSum(elem);
 };
 
+window.getEventCoord = function(e)
+{
+	if (!e)
+		e = window.event;
+	if (e && e.pageX == null && e.clientX != null)
+	{
+		var html = document.documentElement;
+		var body = document.body;
+		e.pageX = e.clientX + (html && html.scrollLeft || body && body.scrollLeft || 0) - (html.clientLeft || 0);
+		e.pageY = e.clientY + (html && html.scrollTop || body && body.scrollTop || 0) - (html.clientTop || 0);
+	}
+	if (e && !e.which && e.button)
+	{
+		if (e.button & 1) e.which = 1;
+		else if (e.button & 4) e.which = 2;
+		else if (e.button & 2) e.which = 3;
+	}
+	return e;
+}
+
 })();
 
 window.json_decode = function(text)