Google To End Support For IE6 March 2010
 

Many other companies have already stopped supporting older browsers like Internet Explorer 6.0 as well as browsers that are not supported by their own manufacturers. We’re also going to begin phasing out our support, starting with Google Docs and Google Sites. As a result you may find that from March 1 key functionality within these products -- as well as new Docs and Sites features -- won’t work properly in older browsers.

http://googleenterprise.blogspot.com...lications.html