Dropdown menus containing lots of items can easily go down below the fold when opened, making lower items inaccessible. Normally if your dropdowns are this long, you reconsider your navigational strategy. But with jQuery Long Dropdown Menu solution you can make your menu items scroll up and down as you move mouse through it.
Implementation is fairly simple and only requires an unordered list to create your dropdown menu. You simply set maximum height of the dropdowns and script will automatically calculate speed multiplier based on the height for scrolling menu items up and down.
Developed by Chris Coyier of CSS-Tricks; jQuery Long Dropdown Menu is available for download License Free. You can find further information, demo & download on CSS-Tricks Website.