var imageFiles_54_28 = new Array();
imageFiles_54_28['0'] = new Array ('_images/54_Manual_System.gif', '_images/54_Manual_SystemMouseover.gif');
imageFiles_54_28['1'] = new Array ('_images/54_Electric_System.gif', '_images/54_Electric_SystemMouseover.gif');

function image_on_54_28 (position) {
   var doc = eval("document.image54_28" + position);
   doc.src = imageFiles_54_28[position][1];
}

function image_off_54_28 (position) {
   var doc = eval("document.image54_28" + position);
   doc.src = imageFiles_54_28[position][0];
}