if (document.images) 
{                //if image object is available     
img1on = new Image();		      // MouseOver Images
img1on.src = "/img/top_1on.gif"; 
img2on = new Image();
img2on.src = "/img/top_2on.gif";  
img3on = new Image();
img3on.src = "/img/top_3on.gif";
img4on = new Image();
img4on.src = "/img/top_4on.gif";
img5on = new Image();
img5on.src = "/img/top_5on.gif";
img6on = new Image();
img6on.src = "/img/top_6on.gif";

img1off = new Image();		      // MouseOut Images
img1off.src = "/img/top_1.gif"; 
img2off = new Image();          
img2off.src = "/img/top_2.gif";
img3off = new Image();
img3off.src = "/img/top_3.gif";
img4off = new Image();
img4off.src = "/img/top_4.gif";
img5off = new Image();
img5off.src = "/img/top_5.gif";
img6off = new Image();
img6off.src = "/img/top_6.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");        }}