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

// open hidden layer
function mopen(id)
{	
    // cancel close timer
    mcancelclosetime();
    var value=parseInt(id);
    var idval="m1"+value;        
    // close old layer
    if(ddmenuitem) ddmenuitem.style.display = 'none';

    // get new layer and show it
    ddmenuitem = document.getElementById(idval);
    ddmenuitem.style.display = 'block';

}
// close showed layer
function mclose()
{
    if(ddmenuitem)
        ddmenuitem.style.display = 'none';
}

// go close timer
function mclosetime()
{
    closetimer = window.setTimeout(mclose, timeout);
}

// cancel close timer
function mcancelclosetime()
    {
    if(closetimer)
    {
	    window.clearTimeout(closetimer);
	    closetimer = null;
    }
}

// close layer when click-out
document.onclick = mclose;