if (document.images) {	

   	www_on= new Image();					www_on.src="images/navigation/www2.gif";  
   	www_off= new Image();					www_off.src="images/navigation/www1.gif";  
	
   	email_on= new Image();					email_on.src="images/navigation/email2.gif";  
   	email_off= new Image();					email_off.src="images/navigation/email1.gif";  
}