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

function nav1Flip() {document.getElementById('na1').style.background = 'url(/images/nav/nav1down.gif) no-repeat top left';}
function nav1FlipOut() {document.getElementById('na1').style.background = 'url(/images/nav/nav1up.gif) no-repeat top left';}

function nav2Flip() {document.getElementById('na3').style.background = 'url(/images/nav/nav2down.gif) no-repeat top left';}
function nav2FlipOut() {document.getElementById('na3').style.background = 'url(/images/nav/nav2up.gif) no-repeat top left';}

function nav4Flip() {document.getElementById('na4').style.background = 'url(/images/nav/nav4down.gif) no-repeat top left';}
function nav4FlipOut() {document.getElementById('na4').style.background = 'url(/images/nav/nav4up.gif) no-repeat top left';}

function nav5Flip() {document.getElementById('na5').style.background = 'url(/images/nav/nav5down.gif) no-repeat top left';}
function nav5FlipOut() {document.getElementById('na5').style.background = 'url(/images/nav/nav5up.gif) no-repeat top left';}

function nav9Flip() {document.getElementById('na9').style.background = 'url(/images/nav/nav7down.gif) no-repeat top left';}
function nav9FlipOut() {document.getElementById('na9').style.background = 'url(/images/nav/nav7up.gif) no-repeat top left';}



//dd = drop down
// 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;