var imageFiles_5u_100 = new Array();
imageFiles_5u_100['0'] = new Array ('_images/5u_TAIL_UP.gif', '_images/5u_TAIL_UPMouseover.gif');

function image_on_5u_100 (position) {
   var doc = eval("document.image5u_100" + position);
   doc.src = imageFiles_5u_100[position][1];
}

function image_off_5u_100 (position) {
   var doc = eval("document.image5u_100" + position);
   doc.src = imageFiles_5u_100[position][0];
}