if (document.images) {	

   	menu1_on = new Image();				menu1_on.src="images/sub_gifs/menu1b.gif";  
	menu1_off = new Image(); 			menu1_off.src="images/sub_gifs/menu1a.gif";  		
	
   	menu2_on = new Image();				menu2_on.src="images/sub_gifs/menu2b.gif";  
	menu2_off = new Image(); 			menu2_off.src="images/sub_gifs/menu2a.gif";  		
	
	menu3_on = new Image();				menu3_on.src="images/sub_gifs/menu3b.gif";  
	menu3_off = new Image(); 			menu3_off.src="images/sub_gifs/menu3a.gif";  		
	
	menu4_on = new Image();				menu4_on.src="images/sub_gifs/menu4b.gif";  
	menu4_off = new Image(); 			menu4_off.src="images/sub_gifs/menu4a.gif";  		
	
	menu5_on = new Image();				menu5_on.src="images/sub_gifs/menu5b.gif";  
	menu5_off = new Image(); 			menu5_off.src="images/sub_gifs/menu5a.gif";  		
		
   }