Imagebrowser under PHP doesn't work

Got the complete FCKeditor good working in asp. Now I edited a part so images will automatically resize with uploading, but this script is in php. Under asp I can see the files, but in php it doesn't work. Because the resizing is in PHP, I want the browser to work under PHP. The files I upload in PHP are correctly resized and placed at the server, but I cannot see them. The window stays empty. Anyone who can help me with this?