Were you presenting the HTML page as an HTML item or as a Custom item in your questionnaire? Or maybe it was entered in your Experiment file? I'd be curious to get a copy of the que (or exp) file that calls it as well as a copy of the html and php files. Is this version 2006?
ps., for other users, Tom found the following work around:
it´s not necessary to answer my question in the forum immediately. I made it in another way: I start the internet explorer via the Iexplore.exe command and put the url in the parameters.
It works ;-)
Tom