if (document.images) {
            img1on = new Image();
            img1on.src = "http://www.atteviks.se/images/Menybilder/dela_button.jpg";
            img1off = new Image();
            img1off.src = "http://www.atteviks.se/images/Menybilder/dela_hover.jpg"; 

}
function imgOn(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "on.src");}
}
function imgOff(imgName) {
if (document.images) {
document[imgName].src = eval(imgName + "off.src");}
}