В момента ти е така - <a href="#" onclick="javascript:showlayer('paypal')">CREATE PREMIUM ACCOUNT WITH PAYPAL</a>
пробвай така
<a href="javascript:;" onclick="javascript:showlayer('paypal')">CREATE PREMIUM ACCOUNT WITH PAYPAL</a>
или така
<a href="JavaScript:void(0);" onclick="javascript:showlayer('paypal')">CREATE PREMIUM ACCOUNT WITH PAYPAL</a>