Unfortunately, you can't. That's the short answer. However if you have an equalizer that looks something like this (I know you've seen these before)
http://www.soundblaster.com/images/inline/articles/fap33.gif
If it's a humming noise coming from the AC, fridge, etc. then reduce the lower frequencies. If it's more of a background hissing, then reduce the higher frequencies. Basically, it's just common sense. Hope this helps!
EDIT
Sorry, I didn't read your question thoroughly the first time. In this case, you're out of luck. Best you can do is play some Weird Al in the background and hope no one notices...
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