I have an older site that is just about 200 static html pages. I need to modify html code for each page with different numbers, like the following:

What I'd like to do is to make the edits to all of them, all at once. I searched the web for FIND/REPLACE MULTIPLE FILE software; I donít know which one is the right one.

Does anyone know if there is any program that will solve this problem?

Thanks in advance for your help.