if (document.images) {	

  	email_on= new Image();			email_on.src="images/email2.gif";  
	email_off= new Image(); 		email_off.src="images/email1.gif";

  	submit_on= new Image();			submit_on.src="images/submit2.gif";  
	submit_off= new Image(); 		submit_off.src="images/submit1.gif";

  	bio_on= new Image();			bio_on.src="images/bio2.gif";  
	bio_off= new Image(); 			bio_off.src="images/bio1.gif";

  	return_on= new Image();			return_on.src="images/return2.gif";  
	return_off= new Image(); 		return_off.src="images/return1.gif";

   }