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';

	/**
	 *  This condition for iacbe in pgpm.html 
	 */
	if(id == "mm1") {
		ddmenuitem.style.display = 'block';
	}
}

// Close showed layer
function mclose() {

	if(ddmenuitem) ddmenuitem.style.visibility = 'hidden';

	/**
	 *  This condition for iacbe in pgpm.html 
	 */
	if(ddmenuitem.id == "mm1") { 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;