var imageFiles_bu_31 = new Array();
imageFiles_bu_31['0'] = new Array ('_images/bu_Celling.gif', '_images/bu_CellingMouseover.gif');

function image_on_bu_31 (position) {
   var doc = eval("document.imagebu_31" + position);
   doc.src = imageFiles_bu_31[position][1];
}

function image_off_bu_31 (position) {
   var doc = eval("document.imagebu_31" + position);
   doc.src = imageFiles_bu_31[position][0];
}