function newImage(arg) {

if (document.images) {

rslt = new Image();

rslt.src = arg;

return rslt;

}

}



function changeImages() {

if (document.images && (preloadFlag == true)) {

for (var i=0; i<changeImages.arguments.length; i+=2) {

document[changeImages.arguments[i]].src = changeImages.arguments[i+1];

}

}

}



var preloadFlag = false;

function preloadImages() {

if (document.images) {

buffalo_over = newImage("grassland_images/buffalo_over.jpg");

deer_over = newImage("grassland_images/deer_over.jpg");

bear_over = newImage("grassland_images/bear_over.jpg");

elk_over = newImage("grassland_images/elk_over.jpg");

rhino_over = newImage("grassland_images/rhino_over.jpg");

rodent_over = newImage("grassland_images/rodent_over.jpg");

hippo_over = newImage("grassland_images/hippo_over.jpg");

elephant_over = newImage("grassland_images/elephant_over.jpg");

hyena_over = newImage("grassland_images/hyena_over.jpg");

lion_over = newImage("grassland_images/lion_over.jpg");

rhino_over = newImage("tundra_images/rhino_over.jpg");

horses_over = newImage("tundra_images/horses_over.jpg");

wolves_over = newImage("tundra_images/wolves_over.jpg");

deer2_over = newImage("tundra_images/deer2_over.jpg");

mammoth_over = newImage("tundra_images/mammoth_over.jpg");

birds_over = newImage("tundra_images/birds_over.jpg");

preloadFlag = true;

}

}