Hi,
Not that I know of. I had a similar problem. The way i got around it was to use javascript to control which page of a frame was reloaded. You can achieve much the same functionality as the header () function.
The Javascript is as follows
framename.location.href = 'foo.php?term=' + term;
In this way a php page is loaded into the relevant frame. You can pass GET vars with it too.
Hope it helps
neil