I see the button on the page, but it looks to just be an image with an empty anchor tag around it. The anchor tag is missing the javascript event that's required. Please check out our Common Support Questions area and see the 2nd post:
www.sourcecoast.com/jfbconnect/docs/common-support-questions
Basically, to the <a> tag you have, you'll need to add href="javascript:void(0)" onclick="jfbc.login.login_custom();"
Hope that helps, but if you continue to run into problems, just let us know!
Alex