if (document.images) {          //check for image object
img1on = new Image();           //mouse over images
img1on.src = "images/butthon.gif"; //button used for on image
img2on = new Image(); 
img2on.src = "images/butthon.gif";
img3on = new Image(); 
img3on.src = "images/butthon.gif";
img4on = new Image(); 
img4on.src = "images/butthon.gif";
img5on = new Image(); 
img5on.src = "images/butthon.gif";
img6on = new Image(); 
img6on.src = "images/butthon.gif";
img7on = new Image(); 
img7on.src = "images/butthon.gif";
img8on = new Image(); 
img8on.src = "images/butthon.gif";
img9on = new Image(); 
img9on.src = "images/butthon.gif";
img10on = new Image(); 
img10on.src = "images/butthon.gif";
img11on = new Image(); 
img11on.src = "images/butthon.gif";
img12on = new Image(); 
img12on.src = "images/butthon.gif";
img13on = new Image(); 
img13on.src = "images/butthon.gif";
img14on = new Image(); 
img14on.src = "images/butthon.gif";
img15on = new Image(); 
img15on.src = "images/butthon.gif";
img16on = new Image(); 
img16on.src = "images/butthon.gif";



img1off = new Image();          //mouse out images
img1off.src = "images/buttoff.gif";  //button used for off image
img2off = new Image();
img2off.src = "images/buttoff.gif";
img3off = new Image();
img3off.src = "images/buttoff.gif";
img4off = new Image();
img4off.src = "images/buttoff.gif";
img5off = new Image();
img5off.src = "images/buttoff.gif";
img6off = new Image();
img6off.src = "images/buttoff.gif";
img7off = new Image();
img7off.src = "images/buttoff.gif";
img8off = new Image();
img8off.src = "images/buttoff.gif";
img9off = new Image();
img9off.src = "images/buttoff.gif"; 
img10off = new Image();
img10off.src = "images/buttoff.gif";
img11off = new Image();
img11off.src = "images/buttoff.gif";
img12off = new Image();
img12off.src = "images/buttoff.gif";
img13off = new Image();
img13off.src = "images/buttoff.gif";
img14off = new Image();
img14off.src = "images/buttoff.gif";
img15off = new Image();
img15off.src = "images/buttoff.gif";
img16off = new Image();
img16off.src = "images/buttoff.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");}}