error with lightbox?

Hi, I'm having an issue with the lightbox with the template - it doesn't seem to work on product images etc.

url of a test product - http://www.marlowhotels.info/index.php? ... Itemid=203

when clicking on the main product image, the url seems to be wrong -

http://www.marlowhotels.info/ecocamel.com/index.php?option=com_virtuemart&Itemid=1&page=shop.product_details&flypage=flypage.tpl&product_id=49&category_id=11

ecocamel is another site of mine, so it must be something I've done, but I cannot remember where the setting is? I've checked virtuemart cfg, joomla config, htaccess....i'm a bit lost! Thanks