if ( window.addEventListener ) { 
	var kkeys = [], konami = "38,38,40,40,37,39,37,39,66,65";
	var cover = document.createElement('div');
	cover.style.width = '100%';
	cover.style.height = '100%';
	cover.style.position = 'fixed';
	cover.style.top = '0';
	cover.style.left = '0';
	cover.style.backgroundColor ='#FFEAEA';
	cover.style.opacity = '0.8';
	window.addEventListener("keydown", 
		function(e){ 
			kkeys.push(e.keyCode ); 
			if ( kkeys.toString().indexOf( konami ) >= 0 ) {
				document.body.appendChild(cover);
				//alert("KONAMI!"); 
				kkeys = []; // remove the effect
			}
		}
	, true); 
}