function animheader()
{
	var current = 0;
	var header = document.getElementById('header');
	var img = header.getElementsByTagName('IMG');
	console.log(img);
	
	for(var i=0; i<img.length; i++)
	{
		img[i].id = 'header_img_'+i;

	}
	
	new Effect.Opacity('header_img_'+current, { from: 0, to: 1 , duration: 1.5});
	
	new PeriodicalExecuter(function () {
	
		var next = current + 1;
		if(next >= img.length)
			next = 0;
	
		new Effect.Parallel([
				new Effect.Appear('header_img_'+next, { sync: true,duration: 1.5 }),
				new Effect.Fade('header_img_'+current, {sync: true,duration: 1.5})			
			], {duration: 1.5, delay: 0.5 });
		
		
		current = next;
	}, 3);
}

function _afterfinish(x)
{

}

Event.observe(window, 'load', animheader, false);