Safari extension for notifying changes

Hello,

is there any extension for safari to notify me if the web page content changes?
Or is there generall any other application for doing the above?

THX for helps

Greetings

Mike

No i mean any web page.

Thx in advance

Hello,

i checked out the above links but i would prefer a desktop solution.

The desktop programs at http://www.rba.co.uk/sources/monitor.htm
they do only support Windows systems not OS X.

Is there any other solution?

THX in advance