How to redirect root web site to site collection Sharepoint 2010 IIS 7

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http://serverfault.com – Hello my dear friends! Im having quite a hard time figuring out this problem and i need your help. Here's the scenario: I have a sharepoint 2010 web application on my port 80. This has 2 site collections, the root, and the /sites/official. My problem is: The root site is empty, but in the future it will be my something (i dont know what yet), but my other site collection is ready to go and i already have a internet address for it. what i want to do is configure everthing in way that i can type "http://contoso.com" and get as response my sub-site (yes, its a kind of redirect)... how can i d (HowTos)