if (document.images) {


	img30on = new Image();           
	img30on.src = "images/subbtn_overview_b.gif";  
	img31on = new Image();           
	img31on.src = "images/subbtn_website_b.gif";  
	img32on = new Image();           
	img32on.src = "images/subbtn_newsletters_b.gif"; 
	img33on = new Image();           
	img33on.src = "images/subbtn_print_b.gif"; 


	img30off = new Image();          
	img30off.src = "images/subbtn_overview_a.gif"; 
	img31off = new Image();          
	img31off.src = "images/subbtn_website_a.gif"; 
	img32off = new Image();          
	img32off.src = "images/subbtn_newsletters_a.gif"; 
	img33off = new Image();          
	img33off.src = "images/subbtn_print_a.gif"; 

}