automatically create multiple web pages

I need the ability to automate the creation of 500 similar webpages
for an educational site. Let’s say approximately 100 lessons with
each lesson having 3-5 pages. I already have a program that allows me
to create a template and merge in files. The body of each webpage
will include a line of text and a picture.

Let’s say I will have a Folder on my computer called Text with files
called Lesson1a.txt, Lesson1b.txt, Lesson1c.txt, Lesson2a.txt,
Lesson2b.txt, Lesson2c.txt, Lesson2d.txt,…etc. Then a similar Folder
for the Images – Image1a.jpg, Image1b.jpg,…etc.

Is there a program or routine that can go through the Text folder and
create a file for each entry. Let’s say the files that are created
are called Lesson1a.it, Lesson1b,it,…etc. The program or routine
would create file with contents like:

<p align="center"><font size="6">Lesson1a.txt</font></p> (The routine
would need to place the contents of Lesson1a.txt into the file.)

<img src="Lesson1a.jpg" alt="" border="0" width="180"> (The routine
would need to place the text “Lesson1a.jpg” into the file.)

It would then create the Lesson1a.it file and then continue on for
each file entry in the Folder.