Remove gradient background from UIWebView?

Question

How do remove the gradient from a UIWebView - the one that you see if you overscroll the top or bottom. This code

webView.backgroundColor = [UIColor whiteColor];

just changes the color of the gradient, it doesn't removes it. How can this be done?

(note: not the same question as http://stackoverflow.com/questions/655225/uiwebview-underside)