serious problem with water leakin in my pontiac?

[brandon]

i just bought a 1995 pontiac grand am se 4 door !! and i didnt pay much for the car but i have water leaking from somewhere and its only wet on the floor not the seats not the headliner nothin!! this car has a vinyl top on it!! i checked the doors to make sure water isnt getting in through there it dosent and the windows dont leak either ! so i need help i dont know where it possibly could be coming from and i have stuff to fix the leak but i just dont know where its coming from and its only in certin spots !! please help me i dont know where its coming from