Writing to specific place in file?

I'm trying to modify a PHP form processor script that writes to files. It writes to text files fine, but I would like it to write to a specific place in a file because I want the file to contain HTML tags. I can start this file out by having the proper HTML tags at the top of the file because it just appends to the file. The problem is that the file won't have the proper page closing tags. If I put those tags in the file, the next time the script writes to the file, it writes the variables below the closing HTML tags, so now the page has content outside the HTML tags. I'd like it to be able to write new text right below the previous entry, not to the end of the file. I'm thinking I need to tag each entry with an identifier, have the script search for the last identifier, then write the new entry below that. The only problem is, I don't know how to do this. Is there another way to do this? Thanks, John __________________________________________________ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com