var imageFiles_77_21 = new Array();
imageFiles_77_21['0'] = new Array ('_images/77_Feedback.gif', '_images/77_FeedbackMouseover.gif');

function image_on_77_21 (position) {
   var doc = eval("document.image77_21" + position);
   doc.src = imageFiles_77_21[position][1];
}

function image_off_77_21 (position) {
   var doc = eval("document.image77_21" + position);
   doc.src = imageFiles_77_21[position][0];
}