var imageFiles_3b_21 = new Array();
imageFiles_3b_21['0'] = new Array ('_images/3b_Cats.gif', '_images/3b_CatsMouseover.gif');

function image_on_3b_21 (position) {
   var doc = eval("document.image3b_21" + position);
   doc.src = imageFiles_3b_21[position][1];
}

function image_off_3b_21 (position) {
   var doc = eval("document.image3b_21" + position);
   doc.src = imageFiles_3b_21[position][0];
}