var imageFiles_54_58 = new Array();
imageFiles_54_58['0'] = new Array ('_images/54_Manual_System.gif', '_images/54_Manual_SystemMouseover.gif');
imageFiles_54_58['1'] = new Array ('_images/54_Electric_System.gif', '_images/54_Electric_SystemMouseover.gif');

function image_on_54_58 (position) {
   var doc = eval("document.image54_58" + position);
   doc.src = imageFiles_54_58[position][1];
}

function image_off_54_58 (position) {
   var doc = eval("document.image54_58" + position);
   doc.src = imageFiles_54_58[position][0];
}