var imageFiles_bu_13 = new Array();
imageFiles_bu_13['0'] = new Array ('_images/bu_Celling.gif', '_images/bu_CellingMouseover.gif');

function image_on_bu_13 (position) {
   var doc = eval("document.imagebu_13" + position);
   doc.src = imageFiles_bu_13[position][1];
}

function image_off_bu_13 (position) {
   var doc = eval("document.imagebu_13" + position);
   doc.src = imageFiles_bu_13[position][0];
}