problem with video - what does this mean?

[ponygirl]

hi, I wasn't sure where to put this but maybe someone can tell me what this is...

It's a javascript pop up window with a link to click for a video, when I click the link I get this message in firefox. I haven't let it go to see if the video runs yet, I've never gotten a message like that so I wanted to know if anyone knows what it means first

thanks!