var imageFiles_20_40 = new Array();
imageFiles_20_40['0'] = new Array ('_images/20_Careers.gif', '_images/20_CareersMouseover.gif');
imageFiles_20_40['1'] = new Array ('_images/20_Contact_Us.gif', '_images/20_Contact_UsMouseover.gif');

function image_on_20_40 (position) {
   var doc = eval("document.image20_40" + position);
   doc.src = imageFiles_20_40[position][1];
}

function image_off_20_40 (position) {
   var doc = eval("document.image20_40" + position);
   doc.src = imageFiles_20_40[position][0];
}