var imageFiles_z_9 = new Array();
imageFiles_z_9['0'] = new Array ('_images/z_ENVIRONMENTAL_FACTS.gif', '_images/z_ENVIRONMENTAL_FACTSMouseover.gif');

function image_on_z_9 (position) {
   var doc = eval("document.imagez_9" + position);
   doc.src = imageFiles_z_9[position][1];
}

function image_off_z_9 (position) {
   var doc = eval("document.imagez_9" + position);
   doc.src = imageFiles_z_9[position][0];
}