function Env(){
var ua=navigator.userAgent.toLowerCase();
function check(r){
return r.test(ua);
}
return {
//Determine the environment, operating system, browser, HTTPS connection, and so on
DOC : document,
isStrict : DOC.compatMode == "CSS1Compat" ,
isOpera : check(/opera/) ,
isChrome : check(/bchromeb/) ,
isWebKit : check(/webkit/) ,
isSafari : !check(/bchromeb/)&& check(/safari/) ,
isSafari2 : !check(/bchromeb/)&& check(/safari/)&& check(/applewebkit/4/), // unique to Safari 2
isSafari3 : !check(/bchromeb/)&& check(/safari/)&& check(/version/3/),
isSafari4 : !check(/bchromeb/)&& check(/safari/)&& check(/version/4/),
isIE : !check(/opera/) && check(/msie/) ,
isIE7 : !check(/opera/) && check(/msie/)&& check(/msie 7/) ,
isIE8 : !check(/opera/) && check(/msie/)&& check(/msie 8/) ,
isIE6 : !check(/opera/) && check(/msie/)&&!check(/msie 7/)&& !check(/msie 8/),
isGecko : !check(/webkit/)&& check(/gecko/),
isGecko2 : check(/webkit/)&& check(/rv:1.8/),
isGecko3 : check(/webkit/)&& check(/rv:1.9/),
isBorderBox : !check(/opera/) && check(/msie/)&& DOC.compatMode != "CSS1Compat",
isWindows : check(/windows|win32/),
isMac : check(/macintosh|mac os x/),
isAir : check(/adobeair/),
isLinux : check(/linux/),
isSecure : /^https/i.test(window.location.protocol),

isEmpty : function(v, allowBlank){
return v === null || v === undefined || ((this.isArray(v) && !v.length)) || (!allowBlank ? v === '' : false);
},


isArray : function(v){
return toString.apply(v) === '[object Array]';
},


isDate : function(v){
return toString.apply(v) === '[object Date]';
},


isObject : function(v){
return !!v && Object.prototype.toString.call(v) === '[object Object]';
},


isFunction : function(v){
return toString.apply(v) === '[object Function]';
},


isNumber : function(v){
return typeof v === 'number' && isFinite(v);
},


isString : function(v){
return typeof v === 'string';
},


isBoolean : function(v){
return typeof v === 'boolean';
},


isElement : function(v) {
return !!v && v.tagName;
},


isDefined : function(v){
return typeof v !== 'undefined';
}
}

And then var env = env(); To fetch the desired type using env.s.