Need to write the proper css for a sub navigation drop down menu

Need to write the proper css for a navigation drop down menu with unordered lists items. The main menubar image sprite and css already exist. Required functionality: 1. On hovering over the respective menu items (services and training) the submenu needs to show. 2. On hovering over the different submenu items a different background image needs to show. 3. On clicking on a specific submenu item, the text color needs to change. [login to view URL] menubar items that have a submenu, have a single red chevron to indicate the submenu. On hover the double red chevron needs to show. 5. The drop down menu composed out of 3 elements (submenutop, text part with links (text / list based), submenubottom). Required output: the proper css code. Will deliver the current image sprite, main menubar css and html code.