changing line of text in group of files

Hi, I'm new to Applescript, so I thought I'd ask the pros...
I need to change one line of text in a group of files that I end up with every day (Adobe 3.0 PS files). The line states "ORIGINX 0" and I want it to say "ORIGINX 32".
I'm not sure how to write an Applescript for this, but I have a lot of these files at the end of the day, and I don't want to have to open each one in SimpleText and modify them.
Any help would be MOST appreciated!
Thx!