The most common cause of that is something partially blocking the drain... lodged in the bend in your toilet
1. Plunge good and flush...and repeat, using a good plunger like this:
http://images.google.com/url?q=http:...l/plngrbaf.jpg
2. If that does not take care of it, you snake it out with one of these; a "closet auger":
They're $30 at HomeDepot. This is your first step - and would be a plumber's first step, too...so save yourself the $50-$75 trip charge for a plumber and try this first step yourself.
Let us know how it goes.
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