Regarding Share Markets??

[Asifzaheer]

Salaam to all.
Is buying and selling of shares on sharemarket haraam??.
Traditionalists say that Interaday and investment in Non-Islamic industries(eg :banks ) is Haraam
Some Quran oriented people say buying and selling shares doesnot involve labour(physical/intellectual) and it is mostly a guessing game so it is haraam.

I am totally confused, i believe that it is okay to share tradings.

Plz give ur inputs

Thanx n wasalaam.