How to destroy a Frame with condition

[senthil arasu]

Hi,
In my code logic I need to check the frame existence and then destroy a
frame.
I dont know how to code this  condition.
In Python tutorials what i reffered, "if "condition given only for
integers(like if x>0:)

I need some one to help me.

This is my condition

If  iframe==NULL//if frame not available
  iframe.destroy()

thanks in advance
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