var selectedNode = null;
function OnClickMenu(obj) {
    if (selectedNode == null)
        selectedNode = $(".usermanagemenu_selected");
    selectedNode.removeClass();
    selectedNode.addClass("usermanagemenu_unselected");
    if (selectedNode.next().attr("tagName") == "UL")
        selectedNode.next().css("display", "none");
    selectedNode = $(obj);
    selectedNode.removeClass();
    selectedNode.addClass("usermanagemenu_selected");
    if (selectedNode.next().attr("tagName") == "UL")
        selectedNode.next().css("display", "block");
}