PHP Image Brower headaches

I have tried everything to get the php Brower to work on a linux server. I can get it to work with no problems on a windows based server by:

FCKConfig.ImageBrowserURL = FCKConfig.BasePath + 'filemanager/browser/default/browser.html?Type=grfx&Connector=connectors/php/connector.php&ServerPath=/sitefolder/';

Where grfx is the directory I wish the users to start in and the sitefolder is the folder path from server root to site folder.

But when i try it on a linux system I am unable to find the correct path to to image folder.

Any suggestions?