var clipboard = (function () {

	var disabled = false;
	var contentType = 'text/plain;charset=utf-8'
	document.body.addEventListener('copy', function (e) {
		if (disabled) { return }
		if (e.clipboardData) {
			e.preventDefault();
			e.clipboardData.setData(contentType, canvas.ascii());
		}
		if (window.clipboardData) {
			e.returnValue = false;
			window.clipboardData.setData(contentType, canvas.ascii());
		}
	}, false);

	return {
		enable: function(){ disabled = false },
		disable: function(){ disabled = true }
	}
	
})()