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If you were unlucky and it was not threaded, you are going to have to cut the plastic pipe after the trap. Take this to the store and buy the replacement parts- also remember to by a union to piece the two sections back together. Measure carefully before you put it together with the glue- it is rather hard to seperate. If you need more detail write back and let us know what is unclear.........
Also, It wouldn't hurt to try to break apart the "rotted" plastic from above first if you are replacing it anyway.
Before you rip the ceiling apart, let's attempt what Kansaz is refering to. Remove the cover screen from the drain (usually one screw holds it in the center- sometimes two on the ends). Now take a large common plier (channellocks are ideal) and insert it into the drain with the handles down. Straddle the web inside evenly. Take a large screwdriver or metal bar, place it between the handles and try to loosen the tailpiece. The larger the bar the easier it is for you. If it is threaded, it should loosen after a few #@%*&@
If this does not work then you may have to tear the ceiling. Hope I caught you in time.