Embedded in Mambo, G2 doesn't validate

I tried searching, didn't found any posts with a similar problem.

I have G2 embedded in Mambo and the embedded gallery doesn't validate. I'm no coder but I think the problem is with the following G2 stylesheet references being in the body, not the head part of the document.

I was thinking about placing the references in an assigned mambo template, but I don't know how to 'delete' the ones G2 generates. Hope this makes some sense so somebody..