Toyota Repair: battery or alternator, toyota celica, grounding wire

Question
I have a 88 toyota celica and about every week I have to jump the car to get it started. I took it to autozone and they tested the battery and the alternator and they said both checked out fine. I did notice alot of corrosion on the battery I'm wondering if thats causing it or if I have a grounding wire somewhere? If you have anything else for me to try let me know.
Thanks

Answer
You need to get rid of the corrosion on the battery terminals either by cleaning them or replacing them, if that doesn't help I recommend that you have the system checked for an electrical draw when everything is turned off, there may be a draw from a trunk light or a dome light that causes the battery to drain.