document.onkeyup = keyPress;
var pressNo = 0;
var pressArray = new Array(38,38,40,40,37,39,37,39,66,65);
function keyPress() {
	if (pressNo < pressArray.length && event.keyCode == pressArray[pressNo]) {
		pressNo++;
		if (pressNo == pressArray.length)
			document.getElementById('body').style.backgroundColor = '#FFF000';
	} else pressNo = 0;
}