Force a banner to open to _blank

I’m asking this question on a few websites. Here is my question, just though a few of you fine folks might have some suggestions for me.

Ok, so we have this banner ad system and we plug peoples banners into it. Some people give us .swf files that open to _self or the current window the banner is sitting in.

I was wondering if there is a way to force the .swf to open to a _blank window.

Thanks folks, any help is appreciated!