[jQuery] Slide Panel

[jQuery] Slide Panel


Hi all,
I am working on slide panel similar to
http://www.webdesignerwall.com/demo/jquery/simple-slide-panel.html
Problem: The panel which slides down pushes all the div' s in the page
Excepted: The panel should act as an overlay on the current page
without pushing any div's down
This is my jquery code used
$(document).ready(function(){
    $(".btn-slide").click(function(){
        $("#service").slideToggle("slow");
        return false;
    });
});
Things tired:
I gave z-index to the panel, didnt work , still contents below the
slider gets pushed down
Please give some reference, where i can read /learn from