var timeout    = 500;
var closetimer = 0;
var ddmenuitem = 0;

function ddm_open()
{  
    ddm_canceltimer();
    ddm_close();
    ddmenuitem = $(this).find('ul').css( 'visibility', 'visible' );
}

function ddm_close()
{  
    if( ddmenuitem ) ddmenuitem.css( 'visibility', 'hidden' );
}

function ddm_timer()
{  
    closetimer = window.setTimeout( ddm_close, timeout	);
}

function ddm_canceltimer()
{  
    if( closetimer )
    {  
	window.clearTimeout( closetimer );
	closetimer = null;
    }
}

$(document).ready( function()
{  
    $('#ddm > li').bind( 'mouseover', ddm_open )
    $('#ddm > li').bind( 'mouseout',  ddm_timer )
});

document.onclick = ddm_close;