You are welcomed to check out the following simple examples:
[list]
[li]rotation of an image
[url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2033.0]What do you see? A frog or a horse?[/url][/li]
[li][url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=2016.0]Fenakitiscopio[/url] [/li]
[/list]