If the embedded Quicktime Player plugin does not work in your browser, but only displays a black bar (especially likely if running Windows Vista 64-bit):
1. Right click on the browser icon
2. Select properties
3. Go to the compatibility tab
4. Check the box for "Run this program in compatibility mode for:"
5. Make sure it says "Windows XP (Service Pack 2)" in the drop down list.
6. Press "OK" at the bottom