Using v1.3.9h with ssl.

In admin when adding url to a product (without the http://) all looks fine and after clicking preview where it shows the listing with the wording "For more information, please visit this products webpage." Clicking on the link here works fine and you are taken to the web page. But on the online shop on clicking this you get the error Server Not Found.

Any suggestions ???

Site is www.twowheeltrekkers.co.uk/zencart2/index.php

Thanks in advance

Jenny