Leaking door

Ive got a VERY small gap apeard at the point where the window meets the roof on the drivers door right ontop ov the 3/4 window, and have got ALOT ov water coming in wen it rains. Is it because the door has droped? Any ideas how i can fix the problem??  

put your knee just below the window hands up the top and bent the top in just dont pull to hard
bobby

Ill av a go at that, cheers