Help a mother protect her children

The courts have given custody of my 3 beautifull children to thier abusive father.  Living with me my children were emotionaly stable, happy, bright children, full of love, and loved to learn.
Their father only wants them so he doesn't have to pay child support. He is gone 90% of the time leaving them in the care of his girlfriend or his alcoholic mother. Since the courts have given custody to their father my children have become sad and confused. My oldest, whom previously was never seen with out a smile has now become depressed.
I left him to protect my children from this and now the courts have put them back in harms way.  I fear daily that he will cause them permenant emotional harm if they aren't returned to me soon. Please save my children.

Update 2/11/08

I am still fighting. My exhusband is refusing to cooperate with court ordered visitation. Please pray for my childrens saftey. I miss them so much.