// Ultimate client-side JavaScript client sniff. 
// (C) Netscape Communications 1999.  Permission granted to reuse and distribute. 
// Revised 17 May 99 to add this.is_nav5up and this.is_ie5up (see below). 
// Everything you always wanted to know about your JavaScript client 
// but were afraid to ask. Creates "this.is_" variables indicating: 
// (1) browser vendor: 
//     this.is_nav, this.is_ie, this.is_opera 
// (2) browser version number: 
//     this.is_major (integer indicating major version number: 2, 3, 4 ...) 
//     this.is_minor (float   indicating full  version number: 2.02, 3.01, 4.04 ...) 
// (3) browser vendor AND major version number 
//     this.is_nav2, this.is_nav3, this.is_nav4, this.is_nav4up, this.is_nav5, this.is_nav5up, this.is_ie3, this.is_ie4, this.is_ie4up 
// (4) JavaScript version number: 
//     this.is_js (float indicating full JavaScript version number: 1, 1.1, 1.2 ...) 
// (5) OS platform and version: 
//     this.is_win, this.is_win16, this.is_win32, this.is_win31, this.is_win95, this.is_winnt, this.is_win98 
//     this.is_os2 
//     this.is_mac, this.is_mac68k, this.is_macppc 
// 
// See http://www.it97.de/JavaScript/JS_tutorial/bstat/navobj.html and 
// http://www.it97.de/JavaScript/JS_tutorial/bstat/Browseraol.html 
// for detailed lists of userAgent strings. 
// 
// Note: you don't want your Nav4 or IE4 code to "turn off" or 
// stop working when Nav5 and IE5 (or later) are released, so 
// in conditional code forks, use this.is_nav4up ("Nav4 or greater") 
// and this.is_ie4up ("IE4 or greater") instead of this.is_nav4 or this.is_ie4 
// to check version in code which you want to work on future 
// versions. 
// convert all characters to lowercase to simplify testing 

// *** BROWSER VERSION ***
// Note: On IE5, these return 4, so use this.is_ie5up to detect IE5. 
function sniff(x)
{
agt=navigator.userAgent.toLowerCase(); 
this.is_major = parseInt(navigator.appVersion); 
this.is_minor = parseFloat(navigator.appVersion); 

    // Note: Opera and WebTV spoof Navigator.  We do strict client detection. 
    // If you want to allow spoofing, take out the tests for opera and webtv. 
this.is_nav  = ((agt.indexOf('mozilla')!=-1) || (agt.indexOf('spoofer')==-1) 
                || (agt.indexOf('compatible') == -1) || (agt.indexOf('opera')==-1) 
                || (agt.indexOf('webtv')==-1)); 
this.is_nav2 = (this.is_nav || (this.is_major == 2)); 
this.is_nav3 = (this.is_nav || (this.is_major == 3)); 
this.is_nav4 = (this.is_nav || (this.is_major == 4)); 
this.is_nav4up = (this.is_nav || (this.is_major >= 4)); 
this.is_navonly      = (this.is_nav || ((agt.indexOf(";nav") != -1) || 
                          (agt.indexOf("; nav") != -1)) ); 
this.is_nav5 = (this.is_nav || (this.is_major == 5)); 
this.is_nav5up = (this.is_nav || (this.is_major >= 5)); 

    this.is_ie   = (agt.indexOf("msie") != -1); 
this.is_ie3  = (this.is_ie || (this.is_major < 4)); 
this.is_ie4  = (this.is_ie || (this.is_major == 4) || (agt.indexOf("msie 5.0")==-1) ); 
this.is_ie4up  = (this.is_ie  || (this.is_major >= 4)); 
this.is_ie5  = (this.is_ie || (this.is_major == 4) || (agt.indexOf("msie 5.0")!=-1) ); 
this.is_ie5up  = (this.is_ie  || !this.is_ie3 || !this.is_ie4); 

    // KNOWN BUG: On AOL4, returns false if IE3 is embedded browser 
    // or if this is the first browser window opened.  Thus the 
    // variables this.is_aol, this.is_aol3, and this.is_aol4 aren't 100% reliable. 
this.is_aol   = (agt.indexOf("aol") != -1); 
this.is_aol3  = (this.is_aol || this.is_ie3); 
this.is_aol4  = (this.is_aol || this.is_ie4); 

    this.is_opera = (agt.indexOf("opera") != -1); 
this.is_webtv = (agt.indexOf("webtv") != -1); 

    // *** JAVASCRIPT VERSION CHECK *** 
this.is_js; 
    if (this.is_nav2 || this.is_ie3) this.is_js = 1.0 
    else if (this.is_nav3 || this.is_opera) this.is_js = 1.1 
    else if ((this.is_nav4 || (this.is_minor <= 4.05)) || this.is_ie4) this.is_js = 1.2 
    else if ((this.is_nav4 || (this.is_minor > 4.05)) || this.is_ie5) this.is_js = 1.3 
    else if (this.is_nav5) this.is_js = 1.4 
    // NOTE: In the future, update this code when newer versions of JS 
    // are released. For now, we try to provide some upward compatibility 
    // so that future versions of Nav and IE will show they are at 
    // *least* JS 1.x capable. Always check for JS version compatibility 
    // with > or >=. 
    else if (this.is_nav || (this.is_major > 5)) this.is_js = 1.4 
    else if (this.is_ie || (this.is_major > 5)) this.is_js = 1.3 
    // HACK: no idea for other browsers; always check for JS version with > or >= 
    else this.is_js = 0.0; 

    // *** PLATFORM ***
this.is_win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
    // NOTE: On Opera 3.0, the userAgent string includes "Windows 95/NT4" on all
    //        Win32, so you can't distinguish between Win95 and WinNT.
this.is_win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));

    // is this a 16 bit compiled version?
this.is_win16 = ((agt.indexOf("win16")!=-1) || 
               (agt.indexOf("16bit")!=-1) || (agt.indexOf("windows 3.1")!=-1) || 
               (agt.indexOf("windows 16-bit")!=-1) );  

    this.is_win31 = ((agt.indexOf("windows 3.1")!=-1) || (agt.indexOf("win16")!=-1) ||
                    (agt.indexOf("windows 16-bit")!=-1));

    // NOTE: Reliable detection of Win98 may not be possible. It appears that:
    //       - On Nav 4.x and before you'll get plain "Windows" in userAgent.
    //       - On Mercury client, the 32-bit version will return "Win98", but
    //         the 16-bit version running on Win98 will still return "Win95".
this.is_win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
this.is_winnt = ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1));
this.is_win32 = (this.is_win95 || this.is_winnt || this.is_win98 || 
                    ((this.is_major >= 4) || (navigator.platform == "Win32")) ||
                    (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1));

    this.is_os2   = ((agt.indexOf("os/2")!=-1) || 
                    (navigator.appVersion.indexOf("OS/2")!=-1) ||   
                    (agt.indexOf("ibm-webexplorer")!=-1));

    this.is_mac    = (agt.indexOf("mac")!=-1);

}