Looking for a particular prim parameter script

I'm just wondering if there's a script anywhere that would, on touch or command, let me:

1. change the texture on an object
2. change the texture parameters (horiz offset and so on)

and then touch again and switch it to another texture and set of texture parameters.

Hope this makes sense!

TIA!

Certainly possible. I'd start in the following places:

http://www.lslwiki.net/lslwiki/wakka.php?wakka=texture
http://www.lslwiki.net/lslwiki/wakka.php?wakka=touch_start

If you come up with more specific questions while developing your script, be sure to ask. If you're looking for a pre-made script, there are better places to look, such as the Products Wanted forum or the Scripting Library forum or maybe even SLX (or whatever it's called now).