I'm having some problems with IE and scrollTo/scrollBy between iFrames.

I have a page with two iFrames. What I'm trying to do is to make the first iFrame to scroll the second iFrame.

I have the following code called from the first iFrame, which works great with Firefox and Safari/Chrome, but has zero effect in IE.

What am I doing wrong?
parent.frames["second_iFrame"].window.scrollBy(0, 100);
Thank you.