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Create Closable Tabs Client-Side

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
    <style type="text/css">
        .RadTabStrip .rtsLink img
        {
            border: 0;
            position: relative;
            right: -2px;
            margin-top: 3px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <asp:ScriptManager ID="ScriptManager1" runat="server">
    </asp:ScriptManager>
    <script type="text/javascript">
        var tabStrip1;

        function OnClientLoad() {
            tabStrip1 = $find('<%= RadTabStrip1.ClientID %>');

            for (var i = 0; i < tabStrip1.get_tabs().get_count(); i++) {
                AttachCloseImage(tabStrip1.get_tabs().getItem(i), "delete.gif");
            }
        }

        function addtab() {
            var tab = new Telerik.Web.UI.RadTab();
            tab.set_text("Root RadTab" + tabStrip1.get_tabs().get_count());
            tabStrip1.get_tabs().add(tab);
            AttachCloseImage(tab, "delete.gif");
        }

        function CreateCloseImage(closeImageUrl) {
            var closeImage = document.createElement("img");
            closeImage.src = closeImageUrl;
            closeImage.alt = "Close this tab";
            return closeImage;
        }

        function AttachCloseImage(tab, closeImageUrl) {
            var closeImage = CreateCloseImage(closeImageUrl);
            closeImage.AssociatedTab = tab;
            closeImage.onclick = function (e) {
                if (!e) e = event;
                if (!e.target) e = e.srcElement;

                deleteTab(tab);

                e.cancelBubble = true;
                if (e.stopPropagation) {
                    e.stopPropagation();
                }

                return false;
            }
            tab.get_innerWrapElement().appendChild(closeImage);
        }

        function deleteTab(tab) {
            var tabStrip = $find("<%= RadTabStrip1.ClientID %>");

            var tabToSelect = tab.get_nextTab();
            if (!tabToSelect)
                tabToSelect = tab.get_previousTab();

            tabStrip.get_tabs().remove(tab);

            if (tabToSelect)
                tabToSelect.set_selected(true);
        }

    </script>
    <div>
        <telerik:radtabstrip id="RadTabStrip1" runat="server" selectedindex="0" skin="Office2007"
            onclientload="OnClientLoad">
           <Tabs>
               <telerik:RadTab runat="server" Selected="True" Text="Root RadTab1">
               </telerik:RadTab>
           </Tabs>
       </telerik:radtabstrip>
        <input id="Button1" type="button" value="Add Tab" onclick="addtab()" /></div>
    </form>
</body>
</html>