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');
	}
}

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, 5000); };