/**
 * a kepernyo adatait adja vissza
 */
var screenwidth;
var screenheight;
var scrollTop;
var scrollLeft;

function screen()
{
    if (navigator.appName == "Microsoft Internet Explorer")
    {
        screenwidth  = window.document.body.offsetWidth;
        screenheight = window.document.body.offsetHeight;
        scrollTop    = document.documentElement.scrollTop;
        scrollLeft   = document.documentElement.scrollLeft;
    } else {
        screenwidth  = window.innerWidth;
        screenheight = window.innerHeight;
        scrollTop    = window.pageYOffset;
        scrollLeft   = window.pageXOffset;
    }
}