if (document.images) {	
		
   	hear_on= new Image();					hear_on.src="images/shop/hear2.gif";  
   	hear_off= new Image();					hear_off.src="images/shop/hear1.gif";  
	
   	buy_on= new Image();					buy_on.src="images/shop/buy2.gif";  
   	buy_off= new Image();					buy_off.src="images/shop/buy1.gif";  
}