document.onkeyup = keyNav;


function keyNav(e) {
	var key = (window.event) ? event.keyCode : e.keyCode;
	
	if (document.activeElement.id != 'new-comment-textarea')
		switch (key) {
			case 37:
				location = document.getElementById('button-left').href;
				break;
			case 39:
				location = document.getElementById('button-right').href;
				break;
		}
}