quick way of adding new multiple images as layers?

Hey all, I am trying to edit a multi type shot in CS5, made up of about 30 separate images.
In smaller versions of about 5 or so I have done, I open them all up as separate images, then copy and paste them in as layers over the chosen base image, but with so many it's going to be a pain, so I am assuming there is a way to open my base image then batch add the others as layers directly?

Hopefully my question is making sense !?

Since you mentioned CS5, open Bridge and select the images you want to load as layers. Then go to Tools/Photoshop/Load Files into Photoshop Layers. 30 images may take a minute, but you'll end up with a file with the ~30 layers.

Brilliant! Just tried it and it works a treat. Thank you very much Dennis!

It actually brings me to another question however! How do I select all layers and add a mask to them. I can only seem to do it one at a time, if I select multiple layers the add mask button greys itself out. It's always bugged me!