Looking for a world clock for distance learning

I need a world clock for international delivery of distance learning. Staff and students need to realise the time difference, I’ve been looking for a solution, but not found anything that works in all browsers. All accept The solution was to use http://www.thetimenow.com/ for a nice embed that works in firefox and explorer. There are links that take you to the site for each time zone for lowfi and mobile users Then offer link to http://www.clocklink.com/clocks/world001-blue.swf?TimeZone=BST which displays a nice flash based interactive map. This seems to work in all browsers but the lowfi links are there for extra support. (see image for final effect)