In the link that you posted where things are not working correctly there is an extra slash (/) present in the link:
http://outdoorlightingfixturesonline.com//Products_Detail.php?ProductID=610
When I try this same link without the extra slash it seems to be working ok for me:
http://outdoorlightingfixturesonline.com/Products_Detail.php?ProductID=610
It seems that you may have an extra slash present in your root URL setting in your globals file, if you remove the trailing slash it should fix this issue for you.