I'm still not quite clear on the sequence of events, but I'm going to put what I think is happening and then what I think you should do (this is what we call "error propagation" in my line of work...)

1. Point browser to FOO.html
2. submit form to BAR.pl
3. BAR.pl modifies FOO.html
4. Browser is redirected to FOO.html

Is that right? If so, then the first suggestion is more or less right (for the "less", see use CGI or die;). The key is that those statements must be the first and only things printed to STDOUT by BAR.pl--if you print out a regular header first (using the header() method from CGI.pm), then it will just become part of the document body.

Since I've made a fair passel of assumptions so far, I'll go ahead and assume you're using CGI.pm, as well. In which case, replace your call to print header("text/html"); with one to print redirect($new_url); and all will be well.

I hope some of this is helpful--if my assumptions are totally off, we can go another round. :-)

If God had meant us to fly, he would *never* have give us the railroads.
    --Michael Flanders