opera and long-polling

Hi all,
I am currently developing a widget that makes use of cross domain long-polling using script tags & jsonp.
Basically a script tag is inserted regularly in the header.The server blocks the response upon he has data available for the user. However that can take minutes. Minutes in which the script request is outstanding.

This approach works perfectly in firefox, safari and IE. Only Opera "fails" as it blocks all javascript execution as long as there is an outstanding <script> request.

Is there a way to make this work in opera or must I drop opera support? I even tried to put the script request in an iframe but that still blocks the main page.

Any help is appreciated.

Markus