Draw a user's attention back to a tab
<p>I'm working on a PDF generation process that might take a few minutes.  I'd like to flash the window and maybe change the title as well when the process finishes so it draws the user's attention back to the window when the process is complete.</p>

<p>Is this simple to do?  I've seen code snipplets to change the title, so I supposed I'm looking more for a solution on how to flash the window/tab's color.</p>
