programatically check new versions for eclipse plugin

I am new to Eclipse plugin development. I am developing a plugin which is only available inside an intranet and the user has to be prompted everytime a new version of the plugin is available. The plugin has an update site.

Whats the best way to do this? Is it possible to i开发者_StackOverflownstall the new version programatically?

I am targeting Eclipse 3.4 and higher.

Under preferences: Install/Update -> Automatic Updates you can check Automatically find new update and notify me.