在iPad上暂停HTML5 YouTube视频

I am developing an iPad app that embeds YouTube videos in HTML5 format into a UIWebView. The problem is that I want to pause the video when a user brings up modal dialog windows, rather than clear or stop the video as many have suggested. This is critical to a good user experience. Does anyone know any JavaScript or API that I can run to simply pause the video when an action that presents a modal dialog will occur? I am developing an iPad app that embeds YouTube