Unable to reload page on mouse click

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ASP.NET

XML

HI Everybody,
I have one website where i developed one index page in aspx and used xml to display menu in that page.like menudetails.xml...my problem is during click of menu the url is changing but the page is not reloding as per url...if we click second time then it loads..My xml is the following way..please help how to reload page as per the url changed...

<Menudetails>
  <SubMenus Name="AboutIFSO" CategoryName="About IFSO" CategoryCount="7" NavigateUrl="Index.aspx?id=AboutIFSO" Target="">
    <Category Name="About IFSO" Count="0" ID="274" CategoryName="About IFSO" NavigateUrl="Index.aspx?id=AboutIFSO" Target="">About IFSO</Category>
    <Category Name="Contact Us" Count="0" ID="278" CategoryName="Contact Us" NavigateUrl="Index.aspx?id=ContactUs" Target="">Contact Us</Category>
    <Category Name="IFSO Member Societies" Count="0" ID="277" CategoryName="IFSO Member Societies" NavigateUrl="Index.aspx?id=IFSOMemberSocieties" Target="">IFSO Member Societies</Category>
    <Category Name="Executive Board" Count="0" ID="276" CategoryName="Executive Board" NavigateUrl="Index.aspx?id=ExecutiveBoard" Target="">Executive Board</Category>