var imageFiles_4d_15 = new Array();
imageFiles_4d_15['0'] = new Array ('_images/4d_Components.gif', '_images/4d_ComponentsMouseover.gif');

function image_on_4d_15 (position) {
   var doc = eval("document.image4d_15" + position);
   doc.src = imageFiles_4d_15[position][1];
}

function image_off_4d_15 (position) {
   var doc = eval("document.image4d_15" + position);
   doc.src = imageFiles_4d_15[position][0];
}