HTML 
Drop down 
Menu 
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css drop down menus are good. For Google Chrome, Mozilla firefox, the menu will work better for IE (6/7 +) may not work, as the old versions of IE will not support the CSS3. For that simple Jquery to be included so that the menu would work in all browsers. For detailed CSS jquery menu example with code, please check the following pages:
http://www.freemenu.info/2013/05/js-menu.html
http://www.freemenu.info/2013/06/js10.html