I have a client that wants to recreate an old site. The site's background is currently comprised of a small image repeated in the X direction. On top of that is a semi-transparent image used to simulate a lighting glare.

Now, I can try to force this using Photoshop but I like the load time of the small repeated image. Can I recreate this in the CSS for the main site background? I know how to do the repeated image in the X direction, but how do I overlay another file on top of that?

Depending on the situation you could use the x repeated background in ATO>Body, Text, & Links and then put a background image in ATO>Style & edit Center Column>Center Column Style. Without seeing the example site it's hard to know if this will work though.

Ok, I'll try that once I get all the files updated and uploaded. I'll let you know how it goes. Thanks!