Automatically restart network on lost connection

Often times, for whatever reason, the Internet connection on my Mac will lock up. Only restarting the Airport or Ethernet interfaces seem to resolve the issue in a timely manner. (This is different from a router crash which requires a manual restart of the router — in my case an Airport Extreme.) I have developed some interconnected scripts that will automatically accomplish this task for me when attached to launchctl. This is important for me because I often have to access files over the internet and if the connection has locked up there is no way for me to access them without manual intervention — via Mac OSX Hints