window.onload = function() {
	
	var counter = 2;
	
	var headers = new Array();
	for(var i=1;i<=3;i++) {
		headers[i] = document.getElementById('header_'+i);
		//headers[i].style.visibility='visible';
	}

	setInterval(function() {
		
		changeOpac(0,headers[counter]);
		
		if (counter==1) {
			headers[1].style.zIndex = 2;
			headers[2].style.zIndex = -1;
			headers[3].style.zIndex = 1;
		} else if (counter==2) {
			headers[1].style.zIndex = 1;
			headers[2].style.zIndex = 2;
			headers[3].style.zIndex = -1;			
		} else {
			headers[1].style.zIndex = -1;
			headers[2].style.zIndex = 1;
			headers[3].style.zIndex = 2;			
		}
		
		for(var i=1;i<=50;i++) {
			(function() {
				var trueI = 2*i;
				var obj = headers[counter];
				setTimeout(function() {
					changeOpac(trueI,obj);
				}, trueI*5);
			})();
		}

		counter++;
		
		if (counter>3) counter = 1;

	},2000);

}

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