Mercury Mystique

I have a 1999 murcury Mystique 120.000 that was given to me. It has been siting for two years in a garage. I think I have done all the nessesary jobs to get it road worthy (Fuel pump, battery, new gas, new battery terminals, new tires) I am having a problem geting this car started now. I am losing power some where. When I try to start this car the starter just clicks and all the lights in the car dim. Is it the battery? Do I have a short that drains the battery?
May 24, 2007.

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