[TYPO3] submitting and reading

[Andrea Giorgini]

Hi all,
I've successfully read a POST value with the GPvar function (I know, I'm 
a newbie :-)). Now I would like to say something like: "if this value in 
POST is submitted, show this text". I tried with something like:

page.30 = TEXT
page.30.if.isTrue.value=GPvar:myname
page.30.value = Text to show

but this doesn't show my any text... what's wrong?

Thx,
Andrea