Update leftpane from contentpane

[juststarting]

Hi,

I have a default.aspx page and 3 other pages (left1.aspx, left2.aspx & right.aspx) my default web page is split into 2 (leftpane & contentpane). At the startup left1 is loaded into the leftpane & right into the contentpane. 

On postback in the contentpane I would like to update the leftpane with left2.aspx?x=1&y=2.

All help are appreciated.

    <form id="mainForm" method="post" runat="server">
        <telerik:RadScriptManager ID="ScriptManager" runat="server" />

        <telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server" >
            <telerik:RadSplitter ID="RadSplitter2" runat="server" Height="100%" Width="100%" HeightOffset="126">
                <telerik:RadPane ID="ScreenPane" runat="server" Scrolling="none">
                    <telerik:RadSplitter ID="RadSplitter3" runat="server" LiveResize="true" Orientation="Vertical">
                        <telerik:RadPane ID="LeftPane" runat="server" ContentUrl="Left1.aspx" Width="270px" Scrolling="None">

                        </telerik:RadPane>
                        <telerik:RadSplitBar ID="RadSplitbar1" runat="server" CollapseMode="Forward" EnableResize="true"></telerik:RadSplitBar>
                        <telerik:RadPane ID="ContentPane" runat="server" ContentUrl="Right.aspx" Width="100%" MinWidth="650">

                        </telerik:RadPane>
                    </telerik:RadSplitter>
                </telerik:RadPane>
            </telerik:RadSplitter>
        </telerik:RadAjaxPanel>
    </form>

default.aspx

[juststarting]

I have found the answer.

In my default page I added the following javascript:

<script type="text/javascript">
                //<![CDATA[
                var leftpane = null;

                function reloadLeftPane(navigateUrl) {
                    var splitter = $find("<%= RadSplitter3.ClientID %>");

                    if (navigateUrl && navigateUrl != "#") {
                        leftpane = splitter.getPaneById("<%= LeftPane.ClientID %>");
                        leftpane.set_contentUrl(navigateUrl);
                    }
                }
                //]]>
            </script>

and in the right pane :

<script type="text/javascript">
    function pageLoad() {
        window.parent.reloadLeftPane('Left2.aspx');
    }
</script>