function mail(){
	mailer.style.display='';
	mailer.style.bgcolor='#cc1122';
	menhuer.style.display='none';
	menhuer.style.bgcolor='';
	document.getElementById('Showbackground').style. background='url(images/mail_bg.jpg)';
}
function menhu(){
	mailer.style.display='none';
	menhuer.style.display='';
	mailer.style.bgcolor='';
	menhuer.style.bgcolor='#336699';
	document.getElementById('Showbackground').style. background='url(images/menhu_bg.jpg)';
}