HDRI's Please help....

[DeepFish]

Hellow, i have found a number of good tutorials which explain how to use HDR images in Maya's Mental Ray. It all seems to be working just fine, however, when rendering with HDRIs my renders tent to be oversaturated with one particular color (main color of HDRI, meaning if its outdoor scene with lots of sky, the render will be oversaturated with blue, and if its inside of a room the render will be oversaturated yellow, from yellowish lights) Is there any way to fix this problem? I dont really have any means of tweaking HDRIs themselves, to knock down the saturation a bit, so all adjustments have to be made in Maya. Thank you.

Here I included a couple of renders and HDRIs used for those to illustrate my problem.

http://deepfish.orcon.net.nz/ball.jpg

http://deepfish.orcon.net.nz/volksteather.jpg

http://deepfish.orcon.net.nz/ball2.jpg

http://deepfish.orcon.net.nz/turkenschanz.jpg