Dinamyc "Upload Paths" (Absolute or Relative)

Guys, I'm going totally crazy...

I'm trying to set the upload connectors paths.
I want to dinamically set them (in ASP).

I canghed the config.asp (for the Browser and Upload Filemanagers) assigning a variable (I can set as I like) to "ConfigUserFilesPath".

Now, the problem is that "ConfigUserFilesPath" is relative to the folder of the document.
So I found many problems.

Is it relative to the document where FCKeditor is included or to the FCKeditor directory?

And there is a way to make it relative to the root directory of the site?

In this last case, I could also keep a variable with the domain and the info reguarding the root directory. But FCKeditor keep working with relative links, so I cannot specify the domain.

Can someone help me to:
1 - Make the directory relative to the root directory of the site (not to the FCKeditor but also not to the wwwroot ... I'd have it relative to wwwroot/site)

OR

2 - Make the directory link absolute, letting me to specify it completely in the variable I use to assign the Upload Path Value.

?

Thank you a lot.
It would really useful!