var cur=0;
var prev=0;
var opacity=0;
var timer;
//var images = ["1.jpg","2.jpg","3.jpg","4.jpg","5.jpg"];
function loop(){
	//alert('looping');
	setTimeout(swapImages,3000);
	prev=cur;
	cur=(cur+1)%images.length;
}

function swapImages(){
	//alert('looping');
	opacity=0;
	var bject = document.getElementById('header').style;
	bject.opacity = (opacity / 100);
	bject.MozOpacity = (opacity / 100);
	bject.KhtmlOpacity = (opacity / 100);
	bject.filter = "alpha(opacity=" + opacity + ")";					
	document.getElementById('header').style.backgroundImage='url('+images[cur]+')';		
	document.getElementById('header2').style.backgroundImage='url('+images[prev]+')';
	timer = setInterval('fade()',30);				
	
	loop();
}
function fade(){				
	var bject = document.getElementById('header').style;
	if(opacity<100){
		bject.opacity = (opacity / 100);
		bject.MozOpacity = (opacity / 100);
		bject.KhtmlOpacity = (opacity / 100);
		bject.filter = "alpha(opacity=" + opacity + ")";
		opacity+=2;
	}else{
		clearInterval(timer);
	}
}