1 xq.Browser = {
  2 	// By Layout Engines
  3 	isTrident: navigator.appName == "Microsoft Internet Explorer",
  4 	isWebkit: navigator.userAgent.indexOf('AppleWebKit/') > -1,
  5 	isGecko: navigator.userAgent.indexOf('Gecko') > -1 && navigator.userAgent.indexOf('KHTML') == -1,
  6 	isKHTML: navigator.userAgent.indexOf('KHTML') != -1,
  7 	isPresto: navigator.appName == "Opera",
  8 	
  9 	// By Platforms
 10 	isMac: navigator.userAgent.indexOf("Macintosh") != -1,
 11 	isUbuntu: navigator.userAgent.indexOf('Ubuntu') != -1,
 12 
 13 	// By Browsers
 14 	isIE: navigator.appName == "Microsoft Internet Explorer",
 15 	isIE6: navigator.userAgent.indexOf('MSIE 6') != -1,
 16 	isIE7: navigator.userAgent.indexOf('MSIE 7') != -1
 17 };