> Is this an internal IE-issue, or could I make my php-script IE-friendly?
There are lots and lots of things that IE does differently then the
rest of the world. Of course, that is because as probably the biggest
monopoly they feel no problems with breaking standards -- at least the
standards they don't make.
This particular issue is, however, not really a standards issue. When
a form is posted or somehting happens to automatically generate a page,
some browsers like Mozilla/Netscape will ask you if you want to reload
the page with the same info or just view the cached version. IE just
doesn't show it.
I usually get around this with a "go back" button on the web page that
submits to the previous web page with all the data. Something of a pain
to code though.