I did it myself. :)
Thanks to me.
just by adding css in javascript.
function open_panel()
{
slideIt();
$('#slider').css({
position: 'absolute',
});
var a=document.getElementById("sidebar");
a.setAttribute("id","sidebar1");
a.setAttribute("onclick","close_panel()");
}
function close_panel(){
slideIn();
$('#slider').css({
position: 'fixed',
});
a=document.getElementById("sidebar1");
a.setAttribute("id","sidebar");
a.setAttribute("onclick","open_panel()");
}