Please bear with me, I am pretty new to Joomla, and I only have a slightly operational knowledge of web design.
So here's what I want to do; Our church streams our sermons every sunday morning from about 10:30 to about 12:30. I want to redirect all pages under our domain (with the exception of the admin page) to the live stream url. I know it's probably just a matter of throwing together a script, but I lack the proficiency to do so from scratch. If someone could just get me started, I think I could tweak whatever parameters I need to to make it do what I want.