// LOAD THE "ON" BUTTONS
img1on=new Image();  img1on.src="/_img/penguin_buddy_buy_2.gif";

// LOAD THE "OFF" BUTTONS
img1off=new Image(); img1off.src="/_img/penguin_buddy_buy.gif";

// FUNCTIONS TO SWITCH THE BUTTONS ON MOUSE EVENTS
function imgOn(whichButton) {
  document.images[whichButton].src=eval(whichButton+"on.src");
  }
function imgOff(whichButton) {
  document.images[whichButton].src=eval(whichButton+"off.src");
  }