var imageFiles_4b_21 = new Array();
imageFiles_4b_21['0'] = new Array ('_images/4b_contact_us.gif', '_images/4b_contact_usMouseover.gif');
imageFiles_4b_21['1'] = new Array ('_images/4b_links.gif', '_images/4b_linksMouseover.gif');
imageFiles_4b_21['2'] = new Array ('_images/4b_privacy.gif', '_images/4b_privacyMouseover.gif');

function image_on_4b_21 (position) {
   var doc = eval("document.image4b_21" + position);
   doc.src = imageFiles_4b_21[position][1];
}

function image_off_4b_21 (position) {
   var doc = eval("document.image4b_21" + position);
   doc.src = imageFiles_4b_21[position][0];
}