[ic] i can't "unset" a form variable

[<kenshin@planetanime.com>]

Hello,
Quick question,  I've set a session varible in a link with something like
this:
[page scan se=/something/sf=description/va=title=this is something]

I would like to be able to clear the value of title immediately after using
it.

[value title][set title][/set]

except this is not working.  I can't seem to find the proper way I am
supposed to do this.

Any help is appreciated.
TIA
Mike K.

Interchage 4.6.5 / perl 5.6.1 / RH 6.2