Both Monita and bigpan ahve good information there, though many home canners (and many biochemists) will say that boiling for at least 20 minutes is required to really do the job.
Also, KKool, if you are doing this for safe canning purposes, I'm sure you realize there's more to it than just boiling the jars.
It is a good idea to buy new lids (just the lid with the rubber ring, not the screw on collar) every time you re-use jars. A small price to pay for a guaranteed seal.
Bring a large pot of water to a boil. Place the jars and covers you want to sterilize into the pot and bring it back to a boil. and let boil for 5 minutes. If you're going to use the jars right away keep them in the pot on a low simmer. Otherwise remove and store until you need them
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Also, KKool, if you are doing this for safe canning purposes, I'm sure you realize there's more to it than just boiling the jars.