Displaying a flash file on my web page

Hello,

I have created the following WP Template:
https://eastcoasttechwriter.ca/wordpress/

I need to change the current cloud photo to a flash file.
In my stylesheet, I changed it as shown below:

#header {
/* background-image: url(‘build/banner.jpg’); */
background-image: url(‘000004731307_HDFlashVideo.flv’);
}

but the flash file won’t display. How do I get my flash file to display?

Thanks.