Newbie..and need assistance with a project.

[Suntat77]

Hi everyone! I'm new to photoshop...but have an idea of what I'm doing. I have a question on how to add 3 photos to another photo. The example is shown here: http://suntat77.multiply.com/photos/photo/38/4

If anyone can help me....I'd appreciate it greatly.
I have photoshop elements 4.0.

Thanks!