function topleftkey(j) {
	for (var i = 1; i < 5; i++) {
		document.getElementById("topleft"+i).style.backgroundPosition = "200px 0";
		document.getElementById("topleftmenucontent"+i).style.display = "none";
	}
	document.getElementById("topleft"+j).style.backgroundPosition = "0 0";
	document.getElementById("topleftmenucontent"+j).style.display = "block";
}