var imageFiles_5t_91 = new Array();
imageFiles_5t_91['0'] = new Array ('_images/5t_HEAD_DOWN.gif', '_images/5t_HEAD_DOWNMouseover.gif');

function image_on_5t_91 (position) {
   var doc = eval("document.image5t_91" + position);
   doc.src = imageFiles_5t_91[position][1];
}

function image_off_5t_91 (position) {
   var doc = eval("document.image5t_91" + position);
   doc.src = imageFiles_5t_91[position][0];
}