+ simple rollover question +

I have created a multiple image rollover and i’m having trouble with the restore image procedure. When the user rolls over a thumbnail the opacity increases on the thumbnail and an image changes to the left of the thumbnails. My problem being is that i would like for only the thumbnail to restore to original state and have the image stay at current state instead of restoring back to previous. Here is a link to what i’m working with: http://www.4nineteen.com/painting.htm
what i want is for the thumbnail only to restore and for the painting to stay according to the thumbnail which has been rolled. Right now both instances restore. Any assistance would be appreciated, sorry if this is a dumb question and even dumber explanation. cheers