This song is in the key of (A#m). So the chords will be:
(A#m)
Jaane tu mera kya hai
(F#)
jaane tu mera kya tha
(A#m)
tu hi mera har pal
(F#)              (A#m)
tu hi har lamha tha..
(A#m)
jaane kaisi kashish hai
(F#)
jaane kaisi khalish hai
(A#m)
kyun yeh saans thami hai
(F#)                     (A#m)
aankhon mein kyun nami hai..
(A#m)
Hai dosti humko yakin tha
(F#)                      (Fm)
dosti aur kuch bhi nahi tha
(A#m)
hai kaisa yeh dard naya sa
(Fm)             (G#)
kyun dil lagta tuta tuta sa..
(A#m)                                      (G#)
Hai jaana dil jaana.. kaise mene na jana Ke pyaar hi hai
(F#)                    (Fm)
yeh jaane tu ya jaane na..
(A#m)                                (G#7)
Jaana dil jaana kaise tune na jana yeh pyaar hi hai haan 
(F#)          (Fm)    (A#m)
jaane tu ya jaane na...[Jaane tu part repeat]
(A#m)             (F#)               (C#)              (F)
Hoti thi tujhse subah har din ki teri dopehar se shaam ki dhun thi 
(G#)                    (F#)
hote the raatein tere baaton mein khoye
(Fm)                    (F)         (A#m)
tere khayalon mein hi jaageo so ye..
(A#m)            (F#)
Tu jo nahi toh kya raha 
(F)  (A#m)
aa aaa..

(G#7)-464544
(F#)/(F)-xx3322