detect legacy android

detectLegacyAndroid.js

$.browser.android = /android/i.test(ua);
$.browser.legacyAndroid = function(){
	if(!$.browser.android){
		return false;
	}
	var threshold = 2.2;
	var res = ua.match(/android\s?([^;^-]+)/i);
	if(!res || res.length<2){
		return false;
	}
	var version = res[1];
	if(version.match(/\./g).length>1){
		version = version.replace(/(\d+\.\d+)\..+/,'$1'); // cut minor versions. ex: 1.6.1 to 1.6
	}
	version = version*1;
	if(version >= threshold){
		return false;
	}
	return true;
}();