var timerID = null

document.addEventListener('dblclick', function() {
	console.log('double click!');

	if (timerID) {
		clearTimeout(timerID);
		timerID = null;
	}

	document.onselectstart = function() {
        return false;
	};

	if (window.getSelection) {
  		if (window.getSelection().empty) {  // Chrome
    		window.getSelection().empty();
  		} else if (window.getSelection().removeAllRanges) {  // Firefox
    		window.getSelection().removeAllRanges();
  		}
	} else if (document.selection) {  // IE?
 	 	document.selection.empty();
	}

	timerID = setTimeout(function() {
		document.onselectstart = function() {
        	return true;
		};
	}, 500);
});