Session Variables...between pages.

Here's the problem. I've got an upload script, attached to a message forum. When the user goes to post a message, they have a link to upload files. When they click the link, it opens a new window with the upload form, and that form handles all the uploading. I then need to pass the filename it uploaded back to the original message form without refreshing. I thought perhaps sessions could do this, but apparently I was mistaken. In conclusion, when the user uploads the file, I need it to pass the filename back to the original page without refreshing the original page, so that it may dump it to SQL. I was going to post this to the PHP-SQL list, but I feel that's not necessary, since the SQL portion of the script is working. I suppose I could write the filename and the session variable to another temporary table, and pull via the $PHPSESSID, but I think there's got to be an easier way to do this. I'm open to all possibilities, so fire away! Thanks in advance for any assistance. Ryan