Why does this script not execute scrollTo(x,y) javascript?

Hello I am trying to create a refresh script to refresh a page on incomming messages,updated posts,ect. Why is x,y not executed useing ex: 1? I have seen a few different methods of reloading a page and keeping scroll position but they seem overkill. I think I would like to use ex: 2, is there any logical way to clear the server side variables using reload() or should I go another route for something like this?

    <script>
    function Refresh()
    {

        var x = window.pageXOffset;
        var y = window.pageYOffset;

        //ex 1:this works but doesnt keep scroll position
        //window.location = window.location.href;

        //ex 2: this works and retains x,y but doesnt refresh $_POST $_GET server side variables
        window.location.reload();

        window.location.scrollTo(x,y);
    }
    //for testing only
    setInterval('Refresh()', 5000);
    </script>

Why does this script not execute scrollTo(x,y) javascript?