Edit in JSFiddle

		function left() {
			$('.result').html('left');
		}

		function right() {
			$('.result').html('right');
		}
        function up() {
            $('.result').html('up');
        }
        function down() {
            $('.result').html('down');
        }

		document.onkeydown = function(evt) {
			evt = evt || window.event;
			switch (evt.keyCode) {
				case 39:
					left();
					break;
				case 37:
					right();
					break;
                case 38:
                    up();
                    break;
                case 40:
                    down();
                    break;                    
			}
		};
	

you click : </br><div class="result"></div>