var imageFiles_8b_21 = new Array();
imageFiles_8b_21['0'] = new Array ('_images/8b_Fertilizer.gif', '_images/8b_FertilizerMouseover.gif');

function image_on_8b_21 (position) {
   var doc = eval("document.image8b_21" + position);
   doc.src = imageFiles_8b_21[position][1];
}

function image_off_8b_21 (position) {
   var doc = eval("document.image8b_21" + position);
   doc.src = imageFiles_8b_21[position][0];
}