var imageFiles_af_4 = new Array();
imageFiles_af_4['0'] = new Array ('_images/af_Reptile.gif', '_images/af_ReptileMouseover.gif');

function image_on_af_4 (position) {
   var doc = eval("document.imageaf_4" + position);
   doc.src = imageFiles_af_4[position][1];
}

function image_off_af_4 (position) {
   var doc = eval("document.imageaf_4" + position);
   doc.src = imageFiles_af_4[position][0];
}