There is another one, from marketwatch
http://bigcharts.marketwatch.com/Enter symbol eg. ZA:NPN (doesn't have to be upper case.)
Trouble with that site is that when you have javascript enabled and select interactive chart, there is a
certain amount of cross site scripting (XSS). I don't like that from a security pov.
You won't be alerted to that with Opera (unless you have a suitable extension), but Firefox with
the NoScript add-on will warn you.
Best to turn off js and just use 'basic' for the charts.