gistfile1.js

// Simple version of http://perfectionkills.com/detecting-event-support-without-browser-sniffing/
function isEventSupported(node, eventName) {
  eventName = 'on' + eventName;

	if (!(eventName in node)) {
		if (!node.setAttribute) {
			node = document.createElement('div');
		}

		if (node.setAttribute) {
			node.setAttribute(eventName, '');
			return (typeof node[eventName] === 'function');
		}
	}

	node = null;

	return true;
}