var imageFiles_20_100 = new Array();
imageFiles_20_100['0'] = new Array ('_images/20_Careers.gif', '_images/20_CareersMouseover.gif');
imageFiles_20_100['1'] = new Array ('_images/20_Contact_Us.gif', '_images/20_Contact_UsMouseover.gif');

function image_on_20_100 (position) {
   var doc = eval("document.image20_100" + position);
   doc.src = imageFiles_20_100[position][1];
}

function image_off_20_100 (position) {
   var doc = eval("document.image20_100" + position);
   doc.src = imageFiles_20_100[position][0];
}