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

// open hidden layer
function mopen(id)
{	
	// cancel close timer
	mcancelclosetime();

	// close old layer
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	// get new layer and show it
	ddmenuitem = document.getElementById(id);
	ddmenuitem.style.visibility = 'visible';

}
// close showed layer
function mclose()
{
	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';
}

// 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;

function show(who) {
    document.getElementById('a0').style.display = 'none';
    document.getElementById('a1').style.display = 'none';
    document.getElementById('a2').style.display = 'none';
    document.getElementById('a3').style.display = 'none';

    document.getElementById(who).style.display = 'block';


}
function showbed(who) {
    document.getElementById('b0').style.display = 'none';
    document.getElementById('b1').style.display = 'none';
    document.getElementById('b2').style.display = 'none';
    document.getElementById('b3').style.display = 'none';

    document.getElementById('b4').style.display = 'none';
    document.getElementById('b5').style.display = 'none';
    document.getElementById('b6').style.display = 'none';

    document.getElementById('b7').style.display = 'none';
    document.getElementById('b8').style.display = 'none';
    document.getElementById('b9').style.display = 'none';
    
    document.getElementById(who).style.display = 'block';


}