var imageFiles_u2_1 = new Array();
imageFiles_u2_1['0'] = new Array ('_images/u2_MIRAGE.gif', '_images/u2_MIRAGEMouseover.gif');

function image_on_u2_1 (position) {
   var doc = eval("document.imageu2_1" + position);
   doc.src = imageFiles_u2_1[position][1];
}

function image_off_u2_1 (position) {
   var doc = eval("document.imageu2_1" + position);
   doc.src = imageFiles_u2_1[position][0];
}