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





var i1 = new Image(); i1.src = '/images/topnav_03.jpg';
var i2 = new Image(); i2.src = '/images/topnav_04.jpg';
var i3 = new Image(); i3.src = '/images/topnav_05.jpg';
var i4 = new Image(); i4.src = '/images/topnav_06.jpg';
var i5 = new Image(); i5.src = '/images/nav1_down.gif';
var i6 = new Image(); i6.src = '/images/nav2_down.gif';
var i7 = new Image(); i7.src = '/images/nav3_down.gif';	
var i8 = new Image(); i8.src = '/images/nav4_down.gif';









function nav1Flip() {document.getElementById('navt1').style.background = 'url(/images/nav2_down.gif) no-repeat top left';}
function nav1FlipOut() {document.getElementById('navt1').style.background = 'url(/images/interior_08.gif) no-repeat top left';}
function nav2Flip() {document.getElementById('navt2').style.background = 'url(/images/nav1_down.gif) no-repeat top left';}
function nav2FlipOut() {document.getElementById('navt2').style.background = 'url(/images/interior_09.gif) no-repeat top left';}


// 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;