Upload to Virtual Server Path

My main directory for my website (www folder) is read only. The write folder (data) is at the same level as the www folder but is mapped virtually & actually exists on another drive.

I've tried writing the entire path (virtual http) to get the images to upload but no luck. E.G. http://www.mysite.com/uploads (which is a virtual http path resolving to o:/isp/rootdirectory/mysite/data/uploads or something like that.

Is there something special I need to do to use the http path? Do I simply use the full path in the function upload.asp file?

Thanks for the update info! I appreciate the fast response. My ISP won't allow write permissions on the www folder. Perhaps I can move the entire forum into the data folder then.

Question: Can I simply store the function_upload file in the read/write folder and change the path in the script that calls that file?

Cam