How to put an input field into the header?

Hello,
how can I put input fields into the header cells? (I'm trying to do a filter feature)
Since I read in this forum that a two row header is kind of difficult, I'm trying to put everything in one cell, I just don't know how to do a newline (br).
Can someone help me with that?
Thanks a lot!
Great Script!
Pythagoras

By the way, is it possible to sort more than one column at the same time? :-)

http://www.activewidgets.com/messages/700-1.htm

To implement custom sort you need to get an array of row index values, re-arrange them and assign back. Look at the grid sort() method source for a hint.

Thanks Alex!!