var imageFiles_4v_28 = new Array();
imageFiles_4v_28['0'] = new Array ('_images/4v_Conference_Center.gif', '_images/4v_Conference_CenterMouseover.gif');

function image_on_4v_28 (position) {
   var doc = eval("document.image4v_28" + position);
   doc.src = imageFiles_4v_28[position][1];
}

function image_off_4v_28 (position) {
   var doc = eval("document.image4v_28" + position);
   doc.src = imageFiles_4v_28[position][0];
}