javascript-ie-mode

gistfile1.js

/* JavaScript to determine browser mode */
function getEngine(){
    var _eng;
    if(window.navigator.appName=="Microsoft Internet Explorer"){ // This is an IE browser. What mode is the engine in?
        if(document.documentMode){ // IE8 or later
            _eng = document.documentMode;
        } else { // IE 5-7
            _eng = 5; // Assume quirks mode unless proven otherwise
            if(document.compatMode){
                if(document.compatMode == "CSS1Compat") {
                    _eng = 7; // standards mode
                }
            }
          // There is no test for IE6 standards mode because that mode  
          // was replaced by IE7 standards mode; there is no emulation.
       }
       // the engine variable now contains the document compatibility mode.
    }
    return _eng;
} // getEngine