jQuery Grid Plugin - jqGrid

I know this is somewhat contrary to what most people want, but we would actually like to implement jqgrid without all of the classes added for themeroller support. Our company has a very specific table design already in place with some Flex based products and we're looking to match that design as closely as possible which themeroller just doesn't do a good job of. I understand that the simple solution is to not upload any of the css or assets for themeroller, but we have other jquery-ui controls in place already so the grid automatically picks up the styling. Plus the extra class markup is unecessary in this case.

So this is my question: Is there some way to specify which classes are added instead of the themeroller default classes? Or maybe a way to remove all classes from the grid entirely?

Any help is much appreciated, thanks!