menu, selecting the right item

Hi,
I have the following menu on my site:
<div id="menu"> <ul id="nav"> <li id="selected"><asp:LinkButton id="lnkbtnHome" PostBackUrl="~/login.aspx" runat="server" CausesValidation="false"><span>Home</span></asp:LinkButton></li> <li><asp:LinkButton ID="lnkbtnParticipants" PostBackUrl="~/information/Information.aspx" runat="server" CausesValidation="false"><span>Information</span></asp:LinkButton></li> <li><asp:LinkButton id="lnkbtnCustodial" PostBackUrl="~/custodial/Custodial.aspx" runat="server" CausesValidation="false">Custodial</asp:LinkButton></li> <li><asp:LinkButton id="lnkPlacements" PostBackUrl="~/placement/Placement.aspx" runat=" ...