var imageFiles_bk_15 = new Array();
imageFiles_bk_15['0'] = new Array ('_images/bk_More_References.gif', '_images/bk_More_ReferencesMouseover.gif');

function image_on_bk_15 (position) {
   var doc = eval("document.imagebk_15" + position);
   doc.src = imageFiles_bk_15[position][1];
}

function image_off_bk_15 (position) {
   var doc = eval("document.imagebk_15" + position);
   doc.src = imageFiles_bk_15[position][0];
}