var url = document.location.pathname.toLowerCase();
var className = "current_page_item";

switch (url)
{
    case ("/"):
        document.getElementById("home_li").className = className;
    break;
    case ("/home"):
        document.getElementById("home_li").className = className;
    break; 
    case ("/home/index"):
        document.getElementById("home_li").className = className;
        break;
    case ("/home/aspnet"):
        document.getElementById("aspnet_li").className = className;
        break;
    case ("/home/winform"):
        document.getElementById("winform_li").className = className;
        break;
    case ("/home/silverlight"):
        document.getElementById("silverlight_li").className = className;
        break;
    case ("/home/game"):
        document.getElementById("game_li").className = className;
        break;
    case ("/home/sendmail"):
        document.getElementById("sendmail_li").className = className;
        break;
    case ("/home/about"):
        document.getElementById("about_li").className = className;
        break;
    case ("/home/friendlink"):
        document.getElementById("friendlink_li").className = className;
        break; 
}