i want to remove the task bar,manu bar from a child window

var mylocation="page_name"
var winheight=100
var winsize=100
var x=5
var newwindow = '';
var url = "page_name"
function popitup()
{
    document.getElementById("smt").style.display='none';
    if (!newwindow.closed && newwindow.location)
    { newwindow.location.href = url; }
    else
    {
        newwindow=window.open(url,'','toolbar=no,location=no,menubar=no,scrollbars=yes');
        if (!newwindow.opener) newwindow.opener = self;
    }
    if (window.focus)
    {
        newwindow.focus()
        newwindow.moveTo(0,0)
        newwindow.resizeTo(screen.availWidth, screen.availHeight)
        window.opener=""
        window.close(0);
    }
    return false;
}