Many web pages include multimedia content, such as videos, animations and sounds. If these don't show up or play properly, it's likely that your browser is missing one or
more plug-Ins.

Firefox and Internet Explorer 7 will warn if they don't have the right plug-in to show a multimedia item, but it can be easy to miss the warning produced
by Internet Explorer.

Look out for a yellow bar - the information bar - appearing at the top of the page. Clicking on this will usually give the option to install the necessary program.