Main hoon na

I'm watching Main Hoon Na, another SRK movie. The title means "I'm here now, don't worry" or some variation thereof.
http://v.youku.com/v_show/id_XMzQ3NjI2MzI4.html

A couple of words I picked up there:

सक  sak - doubt  

फ़र्ज (m) farja  -duty

मतलब (m)  -matlab- meaning

THE SONG LYRICS with translations http://www.bollywhat.com/lyrics/mhn_lyr.html

Songs with subtitles :
http://www.youtube.com/watch?v=EDD_CE9q82k

http://www.youtube.com/watch?v=H3I-B6vsnhA
http://www.youtube.com/watch?v=3ejCGYm_TfY
http://www.youtube.com/watch?v=zWHdOvvcruo
http://www.youtube.com/watch?v=nd_VIPPneYY
http://www.youtube.com/watch?v=M3mD3HFT2Gk
http://www.youtube.com/watch?v=pcWih0kayLo