var header_img_bg = 1;
	
	window.addEvent('domready', function() {
		
		var bgFore = $('header_bg_1'),
			bgRear = $('header_bg'),
			value = 1;
		var setBackgroundImage = function(){
			value = header_img_bg;
			
			bgFore.fade('hide');
			bgFore.setStyle('background-image', 'url(/images/header_'+value+'.png)');
			
			(function(){bgFore.get('tween', {property: 'opacity', duration: 3500}).start(0,1);}).delay(2000);
			
			(function(){bgRear.setStyle('background-image', 'url(/images/header_'+value+'.png)');}).delay(5600);
			
			if (header_img_bg>11){
				header_img_bg = 1;
			}else{
				header_img_bg++;
			};
		};
		setBackgroundImage.periodical(6000);
		var loadBG = setBackgroundImage();
		
	});