Photoshop Automated Batch Action

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Job Description

I need help creating an Automated Batch Action that will grab all my shirt design trasparent .psd files and place them (or merge them) ontop of my Shirty Styl .jpg files from another folder.

For example, I have a folder with 1 white t-shirt .jpg file.
I have another file with 300 different shirt designs that are transparent .psd files.
I need a new file that will show all my shirt designs on the White T-shirt.

I need someone that can show me how to create this Automated Batch Action that will work in Photoshop 7.0.