[Typo3] supply a variable into a textfield of a contactform?

[R. Hornig]

hello newsgroup,

i'm very new to typo3 and currently i'm trying the following:

the user click on a dynamic generated link which refer to a contactform. 
the link he clicked supply a variable which should be insertet in a 
textfield of this contactform.

how do i realize this?

thanks in advance for any idea or tip.


best regards,
rené

p.s. sorry for the poor english ;-)