function KeyboardInput() {
	var keys = [];
	var press = [];
	var release = [];

	this.attach = function() {
		for(var i = 0; i < 256; i++) {
			keys[i] = false;
			press[i] = false;
			release[i] = false;
		}

		window.addEventListener("keydown", function(event) {
			var keyCode = event.which || event.keyCode;

			/*if(null != document.getElementById("chat")) {
				var span = document.createElement("span");
				var text = document.createTextNode(keyCode);
				span.appendChild(text);
				document.getElementById("chat-output").appendChild(span);
			}*/

			if(!keys[keyCode]) {
				press[keyCode] = true;
			}
			keys[keyCode] = true;
			if(keyCode == Keys.Alt || keyCode == Keys.F1) {
				event.preventDefault();	
			}
		});

		window.addEventListener("keyup", function(event) {
			var keyCode = event.which || event.keyCode;
			if(keys[keyCode]) {
				release[keyCode] = true;
			}
			keys[keyCode] = false;
			if(keyCode == Keys.Alt || keyCode == Keys.F1) {
				event.preventDefault();	
			}
		});
	}

	this.isPressed = function(code) {
		var pressed = press[code] && keys[code];
		press[code] = false;
		return pressed;
	}

	this.isReleased = function(code) {
		var released = release[code] && !keys[code];
		release[code] = false;
		return released;
	}

	this.isDown = function(code) {
		return keys[code];
	}

	this.clearBuffer = function() {
		for(var i = 0; i < 256; i++) {
			press[i] = false;
		}
	}
};

window.Keys = {
	Left: 37,
	Up: 38,
	Right: 39,
	Down: 40,
	W: 87,
	A: 65,
	S: 83,
	D: 68,
	I: 73,
	E: 69,
	F: 70,
	M: 77,
	T: 84,
	Space: 32,
	Enter: 13,
	Escape: 27,
	Esc: 27,
	Alt: 18,
	Shift: 16,
	Ctrl: 17,
	F1: 112,
	F2: 113,
};