var imageFiles_4b_1 = new Array();
imageFiles_4b_1['0'] = new Array ('_images/4b_Brake_System.gif', '_images/4b_Brake_SystemMouseover.gif');

function image_on_4b_1 (position) {
   var doc = eval("document.image4b_1" + position);
   doc.src = imageFiles_4b_1[position][1];
}

function image_off_4b_1 (position) {
   var doc = eval("document.image4b_1" + position);
   doc.src = imageFiles_4b_1[position][0];
}