[jQuery] find table column's (td's) header (th) ?

[R. Rajesh Jeba Anbiah]

I'm just wondering if there is any easy way to find out the header
(th) of the table column (td)?
Say,
----------------------
| head1 | head2 |
----------------------
| r11     |  r12     |
----------------------
| r21     |  r22     |
----------------------

     Here, r22's heading is "head2"

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