unclouded

Hey all, I'm looking to use {$invoice_link} as a button in an HTML email, but {$invoice_link} produces the a tag as well. I want to use something like this: <a href="{$invoice_link}">Click Here</a> But what I get is <a href="<a href="http://linktoinvoice.com">http://linktoinvoice.com</a>">Click Here</a> I'd like a merge tag which just produces the actual URL, not an hypertext link. Is there a way we can do this?