change target value in a servlet

Hi
It is possible to change the value of the attribute "target" in a
servlet.
Example of what I want to do:
I have in a page HTML the code is :
< FORM ACTION="./myservletA "target="under" >
and in myserveltA the code is:
if(testOK)
a page HTML goes in the frame "under"
else
I want to change the value of target to "left" to call a page HTML in
this frame.

Thanks a lot

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