I think you want to use select.

if ($query{submit} eq "PDF") {
        open OUTPUT, ">tempfile.html" or graceful_exit("can't open fil
+e");
        select OUTPUT;
}
#This goes to tempfile.html if conditions are true STDOUT otherwise 
print "blah blah blah"; 
select STDOUT;
print "blah blah blah"; #This goes to STDOUT
[download]

--

flounder