problems with relative images paths

Hi together,

i have some problems using FCKeditor. My environment of the editing:

lets say i have the following directory strcuture:

+--application
| +--tools
| | +-- FCKEditor
| +-- scripts
| | +-- edit_file.php
+-- files
| +-- xyz
| | +-- images
| | +-- mytest.html


Now i want edit the mytest.html. For that i create a FCKEditor as shown in the test.html file of FCKEditor/_test in my php file edit_file.php. The problem is now:

The mytest.html is shown correctly in the editor except the images. This images have relative paths to the images folder in files/xyz. The images are displayed only with an border.

Can i change the images base folder for the editing window??

thanks for helping

Timo