各大主流浏览器背景渐变设置

1、firefox

http://irene.higgses.com/tag/moz-linear-gradient

2、webkit(Safari4+, Chrome)

http://www.cnblogs.com/wqj0405/archive/2010/09/30/1839232.html

3、IE

http://msdn.microsoft.com/en-us/library/ms530752%28v=vs.85%29.aspx