var imageFiles_4e_21 = new Array();
imageFiles_4e_21['0'] = new Array ('_images/4e_References.gif', '_images/4e_ReferencesMouseover.gif');

function image_on_4e_21 (position) {
   var doc = eval("document.image4e_21" + position);
   doc.src = imageFiles_4e_21[position][1];
}

function image_off_4e_21 (position) {
   var doc = eval("document.image4e_21" + position);
   doc.src = imageFiles_4e_21[position][0];
}