var imageFiles_4f_21 = new Array();
imageFiles_4f_21['0'] = new Array ('_images/4f_Tech_Support.gif', '_images/4f_Tech_SupportMouseover.gif');

function image_on_4f_21 (position) {
   var doc = eval("document.image4f_21" + position);
   doc.src = imageFiles_4f_21[position][1];
}

function image_off_4f_21 (position) {
   var doc = eval("document.image4f_21" + position);
   doc.src = imageFiles_4f_21[position][0];
}