var imageFiles_15_40 = new Array();
imageFiles_15_40['0'] = new Array ('_images/15_Puppy_Eats.gif', '_images/15_Puppy_EatsMouseover.gif');

function image_on_15_40 (position) {
   var doc = eval("document.image15_40" + position);
   doc.src = imageFiles_15_40[position][1];
}

function image_off_15_40 (position) {
   var doc = eval("document.image15_40" + position);
   doc.src = imageFiles_15_40[position][0];
}