Javascript code to check if Chrome Frame is available.

chromeFrameIsAvailable.js

var chromeFrameIsAvailable = (function(){
	var ua = navigator.userAgent.toLowerCase();
	if (ua.indexOf('chromeframe') >= 0 || ua.indexOf('x-clock') >= 0) return true;
	if (typeof window.ActiveXObject != 'undefined') try {
		if (new ActiveXObject('ChromeTab.ChromeFrame')) return true;
	} catch(e) {};
	return false;
})();