Reduce or eliminate background noise

I have seen this issue touched upon in other forums, but really need a straightforward answer to this question as we are working on a project for a school teacher that is retiring, and want to give her a good memory to take with her. Unfortunately, when the person taking the video was doing it, they did it near screaming children. So we have interviews with students that we can barely hear due to the background noise. (We are on a tight deadline so a second take is not an option).
The question is: step-by-step using iMovie HD 06, can we reduce the background noise so that we can eliminate or reduce the screaming children in the background, and keep the sound of the child that is speaking?
If this can be accomplished by the equalizer, again please provide pretty specific instructions, as I can be dense at time.
I can raise the volume on the soundtrack, but that seems to make both the child's voice louder and the background noise louder.
Please! Any help would be immensely appreciated.
Thanks in advance.
Russell

Hi
As Karsten writes.
There are no magic audio program that can differ sound You want from sound You don't.
As I learned from TV-broadcasting. Most TV-programs are dubbed. Original audio
out and playback audio added.
Yes all text has to be lip-sync-read one more time. Tedious but this is how
some in Street talks are done. (You don't hear a car although You see them)
BUT: With expert microphone tech. Special mic which has to be mouth close placed and
a very narrow uptake much can be done - but most often by Pro-people.
Yours Bengt W

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