var imageFiles_7u_4 = new Array();
imageFiles_7u_4['0'] = new Array ('_images/7u_History_of_Leather.gif', '_images/7u_History_of_LeatherMouseover.gif');

function image_on_7u_4 (position) {
   var doc = eval("document.image7u_4" + position);
   doc.src = imageFiles_7u_4[position][1];
}

function image_off_7u_4 (position) {
   var doc = eval("document.image7u_4" + position);
   doc.src = imageFiles_7u_4[position][0];
}