function newImage(arg) {
        if (document.images) {
                rslt = new Image();
                rslt.src = arg;
                return rslt;
        }
}
userAgent = window.navigator.userAgent;
browserVers = parseInt(userAgent.charAt(userAgent.indexOf("/")+1),10);
mustInitImg = true;
function initImgID() {di = document.images; if (mustInitImg && di) { for (var i=0; i<di.length; i++) { if (!di[i].id) di[i].id=di[i].name; } mustInitImg = false;}}
function findElement(n,ly) {
        d = document;
        if (browserVers < 4)            return d[n];
        if ((browserVers >= 6) && (d.getElementById)) {initImgID; return(d.getElementById(n))}; 
        var cd = ly ? ly.document : d;
        var elem = cd[n];
        if (!elem) {
                for (var i=0;i<cd.layers.length;i++) {
                        elem = findElement(n,cd.layers[i]);
                        if (elem) return elem;
                }
        }
        return elem;
}
function changeImages() {
        d = document;
        if (d.images) {
                var img;
                for (var i=0; i<changeImages.arguments.length; i+=2) {
                        img = null;
                        if (d.layers) {img = findElement(changeImages.arguments[i],0);}
                        else {img = d.images[changeImages.arguments[i]];}
                        if (img) {img.src = changeImages.arguments[i+1];}
                }
        }
}

var preloadFlag = false;
function preloadImages() {
        if (document.images) {
                over_nav_ebene2_wir_02 = newImage(/*URL*/'images/nav-ebene2-wir_02-down.jpg');
                preloadFlag = true;
        }
}