tiling a texture in CS3

I am using Photoshop CS3.
I created a new image measuring 512X512
I opened a small tilable texture in a new layer
How do I tile this new texture across my 512 image?
I tried using the Pattern Maker in filters, but it distorted my original texture
Thanks,
Ethan

open the image you want to tile, go to edit and select Define Pattern (definir motivo in spanish), call it as you want, open the 512x512pixels image go to Edit>> Fill and in the dropdown meny choose pattern (motivo) the box under this dropdown menu will be on now, click on it select the pattern you define before, press ok and you are done.

in this website is a small tutorial about it too

http://www.geocities.com/dhouseng/definepattern.html

Thanks very much