function changeOpac(opacity, id)
{
    var object = $(id);
    object.style.opacity = (opacity / 100);
    object.style.MozOpacity = (opacity / 100);
    object.style.KhtmlOpacity = (opacity / 100);
    object.style.filter = "alpha(opacity=" + opacity + ")";
}

function HideLayers()
{
	for(var i=2; i<=6; i++)
	{
		$('img'+i).style.display='none';
		$('desc'+i).style.display='none';
		$('menu'+i).removeClassName('over');
	}
	
	//changeOpac(0, 'img_1');
	//new Effect.Opacity('img_1', {duration:0, from:0, to:0});
}
var defaultTimer = 5000;
var selectedId = null;
var myTimeout = null;
function ContentFocus(id, timer)
{
	if(myTimeout != null) clearTimeout(myTimeout);
	if(selectedId!=null)
	{
		$('img'+selectedId).style.display='none';
		$('desc'+selectedId).style.display='none';
		$('menu'+selectedId).removeClassName('over');
	}
	selectedId = id;	
	$('img'+id).style.display='block';
	$('desc'+id).style.display='block';
	changeOpac(0, 'img'+id);
	changeOpac(0, 'desc'+id);
	new Effect.Opacity('img'+id, {duration:0.5, from:0, to:1});
	new Effect.Opacity('desc'+id, {duration:0.5, from:0, to:1});
	$('menu'+selectedId).addClassName('over');
	
	id++;
	id = id>6?id=1:id;
	myTimeout=setTimeout('ContentFocus('+id+','+defaultTimer+')', timer);
}

window.onload=function (){ContentFocus(1, 6000);};