Hi,
I think you can try it with the javascript event handler
'OnChange'. Like:
<input type=text onchange="document.forms[0].submit();">
Erm, I don't know, if it is really important, but you've
posted your question into a german message board. And I think
it could be possible that no one like to answer because you've
written in english.
Bye, Oliver.
ps: I know, my english skills are worse.