function getBrowserVersion() {
appname= navigator.appName;
appversion = navigator.appVersion;
majorver = appversion.substring(0, 1);
if ( (appname == "Netscape") && ( majorver >= 3 ) ) return 1;
if ( (appname == "Microsoft Internet Explorer") && (majorver >= 4) ) return 1;
return 0;
}function switch_image(num, imgname) {
if (getBrowserVersion()) {
document[imgname].src = img[num].src;
}
}

<!-- förladdning (preload) av bilder som ska användas -->

imagesrc = new Array();
imagesrc[0] = "img/buttons/hem.jpg";
imagesrc[1] = "img/buttons/hem_over.jpg";
imagesrc[2] = "img/buttons/pagang.jpg";
imagesrc[3] = "img/buttons/pagang_over.jpg";
imagesrc[4] = "img/buttons/kalender.jpg";
imagesrc[5] = "img/buttons/kalender_over.jpg";
imagesrc[6] = "img/buttons/teamet.jpg";
imagesrc[7] = "img/buttons/teamet_over.jpg";
imagesrc[8] = "img/buttons/forare.jpg";
imagesrc[9] = "img/buttons/forare_over.jpg";
imagesrc[10] = "img/buttons/sponsorer.jpg";
imagesrc[11] = "img/buttons/sponsorer_over.jpg";
imagesrc[12] = "img/buttons/media.jpg";
imagesrc[13] = "img/buttons/media_over.jpg";
imagesrc[14] = "img/buttons/tillsalu.jpg";
imagesrc[15] = "img/buttons/tillsalu_over.jpg";
imagesrc[16] = "img/buttons/kontakt.jpg";
imagesrc[17] = "img/buttons/kontakt_over.jpg";

if (getBrowserVersion()) {
img = new Array();
for (i = 0; i < imagesrc.length; i++) {
img[i] = new Image();
img[i].src = imagesrc[i];
}
}