google style menubar

http://www.thangaraju.com/blog/how-to-add-google-style-menu-bar-for-your-blog-google-nav-menu/
有範例 , 不能捲
http://www.jqueryload.com/jquery-dropdown-menu-with-google-style
上捲的script
http://stackoverflow.com/questions/7355592/how-to-build-gmail-like-menu-header

30種menu做法 , 還不賴
http://www.hongkiat.com/blog/drop-down-menu-30-free-scripts-to-enhance-header-navigation/
中文的範例

http://stackoverflow.com/questions/5124389/scroll-then-snap-to-top

可以用 , 但會蓋住後面的
http://www.jtricks.com/javascript/navigation/fixed_menu.html