if (document.images) {       //if image object is available     
img1on = new Image();           // MouseOver Images
img1on.src = "/images/framed2.gif"; 
img2on = new Image();
img2on.src = "/images/noframe2.gif";  

img1off = new Image();                  // MouseOut Images
img1off.src = "/images/framed.gif"; 
img2off = new Image();          
img2off.src = "/images/noframe.gif";
 
}

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");
        }}