Its not difficult at all actually. Just requires a timeout for the onmouseover event. jQuery's hover intent would work wonders. Basically show the submenu on

Its not difficult at all actually. Just requires a timeout for the onmouseover event. jQuery's hover intent would work wonders. Basically show the submenu onmouseover of parent and if no mouseover is detected on the submenu within 400ms => hide the submenu. It gives the user a slight bit of time to move the mouse to the submenu rather than relying on perfect mouse movements.