I have an Object with 6 material channels and I just need to flip the Uvs but I don't want to reset then all -UVW Mapping modifier does that. Any e-z fix?

What do you mean flip? You mean flip as in the UVs are now exactly a mirror image of what they were before? Or do you mean moving them from one ID to another?

If you mean just mirroring them, there is a little button that looks like his >|< at the top of the UV window, that will flip it in the horizontal axis, and if you click hold down on it, there is another option which is the flip vertical axis.

Sorry, I meant mirror. And thank you that worked.