navigator

navigator.js

(function() {
    var bdd = document.createElement("div");
    
    bdd.innerHTML = '<!--[if IE]><q /><![endif]--><!--[if IE 6]><i /><![endif]--><!--[if IE 7]><b /><![endif]--><!--[if IE 8]><s /><![endif]--><!--[if IE 9]><p /><![endif]-->';

    navigator.isMSIE = (bdd.getElementsByTagName('q').length) ? true : false;
    navigator.isMSIE6 = (bdd.getElementsByTagName('i').length) ? true : false;
    navigator.isMSIE7 = (bdd.getElementsByTagName('b').length) ? true : false;
    navigator.isMSIE8 = (bdd.getElementsByTagName('s').length) ? true : false;
    navigator.isMSIE9 = (bdd.getElementsByTagName('p').length) ? true : false;

    // todo
    // navigator.isOpera = Object.prototype.toString.call(window.opera) == "[object Opera]"; //dead
    navigator.isOpera = String(navigator.vendor).match(/opera/gi)? "maybe" : false;
})();

usage.js

document.write(
    "navigator.isMSIE  : " +  navigator.isMSIE + "<br />" +
    "navigator.isMSIE6 : " + navigator.isMSIE6 + "<br />" +
    "navigator.isMSIE7 : " + navigator.isMSIE7 + "<br />" +
    "navigator.isMSIE8 : " + navigator.isMSIE8 + "<br />" +
    "navigator.isMSIE9 : " + navigator.isMSIE9 + "<br />"​ +
    "navigator.isOpera : " + navigator.isOpera + "<br />"
);​