Improvements / additions

• - More robust hiding behavior for both menu and submenus.
• - Submenu indicators(arrows) are automatically added with options to turn this behavior off and customize the indicator's class name.
  • Automatic adding can be turned off by setting options.autoAddSubmenuArrows to false.
  • Class name can be configured via options.submenuClass, default is "submenu".
• - Only single stylesheet for skin "cm_default" required by incorporating IE 6/7 only hack.
• - Style rule "display:none" replaced with: "top:-1000px; left:-1000px" in skin stylesheets to improve cache behavior for IE.
• - More robust skin stylesheets to reduce the risk of native styles interfering with the menu.
  • - Added specificity, for example: "body ul.cm_default" instead of ".cm_default".
  • - Added rules to override likely inherited properties.
• - Opera support built-in by defaulting to doubleclick event for opening the menu.
  • - Event type is overridable via options.operaEvent.