Launching a PNG in a new window not working in IE7

This may not be a question about Flash, but then, maybe it is.

I'm using getURL() to launch a new window to display a PNG. Specifically:

Code:

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getURL(popFile,"_blank");

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where popFile is some file, in this case a .png. In Firefox, it works just fine. If it is another file type, it works just fine. If it is a .png in IE7, I get a blank page.

Here's the kicker, if I select the URL and then hit enter (as if I had just typed it in myself), it works just fine.

Is there something about the way that getURL() works that might be interfering with the process?

This is a popup-blocker case - try googling for "flash getting around popup-blocker" - should get you somewhere :)