var imageFiles_b_1 = new Array();
imageFiles_b_1['0'] = new Array ('_images/b_About_Us.gif', '_images/b_About_UsMouseover.gif');

function image_on_b_1 (position) {
   var doc = eval("document.imageb_1" + position);
   doc.src = imageFiles_b_1[position][1];
}

function image_off_b_1 (position) {
   var doc = eval("document.imageb_1" + position);
   doc.src = imageFiles_b_1[position][0];
}