The following information has arisen from hours of research into and actual website development resulting in:

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Browser Detection Script

This script was originally lifted from the Mozilla developer pages. The current version is at the bottom of:
http://www.mozilla.org/docs/web-developer/sniffer/browser_type.html

Questions or Comments

If anyone has the userAgent string for Windows XP, send it to me and I'll modify the script to detect it as well.

5 September 2002:

Added Windows 2000 detection (thanks to Jason Carter for providing the user agent string).

Modified IE version detection to ignore minor version number.

Added Opera version 5/6 differentiation.

Corrected calculation of is_minor.

Modified calculations for bScripting and is_CSS_standards_compliant to take advantage of new browsers and versions being detected.

A browser detection script for use with the levitate() function as given:


    // convert all characters to lowercase to simplify testing 
    var agt=navigator.userAgent.toLowerCase(); 

    // *** BROWSER VERSION *** 
    // Note: On IE5, these return 4, so use is_ie5up to detect IE5. 
    var is_major = parseInt(navigator.appVersion); 
    var is_minor = parseFloat(navigator.appVersion) - is_major; 

    // 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.
    var is_nav  = ( (agt.indexOf( "mozilla"    ) != -1 ) && 
                    (agt.indexOf( "spoofer"    ) == -1 ) &&
                    (agt.indexOf( "compatible" ) == -1 ) && 
                    (agt.indexOf( "opera"      ) == -1 ) &&
                    (agt.indexOf( "webtv"      ) == -1 )  ); 
    var is_nav6    = (is_nav && agt.indexOf("netscape6")!=-1); 
    var is_nav6up  = is_nav6;
    var is_nav2    = (is_nav && !is_nav6 && (is_major == 2)); 
    var is_nav3    = (is_nav && !is_nav6 && (is_major == 3)); 
    var is_nav4    = (is_nav && !is_nav6 && (is_major == 4)); 
    var is_nav4up  = (is_nav &&             (is_major >= 4)); 
    var is_nav5    = (is_nav && !is_nav6 && (is_major == 5)); 
    var is_nav5up  = (is_nav &&             (is_major >= 5)); 
    var is_navonly = (is_nav && ((agt.indexOf(";nav") != -1) || 
                                 (agt.indexOf("; nav") != -1)) ); 

    var is_ie     = (agt.indexOf( "msie"  ) != -1 ) && 
                    (agt.indexOf( "opera" ) == -1 );

    var is_ie3    = (is_ie && (is_major < 4));
    var is_ie4    = (is_ie && (is_major == 4) && (agt.indexOf("msie 5")==-1) && (agt.indexOf("msie 6")==-1) );
    var is_ie4up  = (is_ie && (is_major >= 4));
    var is_ie5    = (is_ie && (is_major == 4) && (agt.indexOf("msie 5")!=-1) );
    var is_ie5up  = (is_ie && !is_ie3 && !is_ie4);
    var is_ie6    = (is_ie && (is_major == 4) && (agt.indexOf("msie 6")!=-1) );
    var is_ie6up  = (is_ie && !is_ie3 && !is_ie4 && !is_ie5);

    var is_opera    = (agt.indexOf( "opera" ) != -1 );
    var is_opera5   = (is_opera && (agt.indexOf("opera 5")!=-1) );
    var is_opera5up = (is_opera && is_opera5);
    var is_opera6   = (is_opera && (agt.indexOf("opera 6")!=-1) );
    var is_opera6up = (is_opera && !is_opera5);

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

    var is_webtv = (agt.indexOf("webtv") != -1); 


    // *** PLATFORM ***

    var 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.
    var is_win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-1));

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

    var 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".
    var is_win2k = ((agt.indexOf("windows nt 5.0")!=-1));
    var is_win98 = ((agt.indexOf("win98")!=-1) || (agt.indexOf("windows 98")!=-1));
    var is_winnt = (!is_win2k && ((agt.indexOf("winnt")!=-1) || (agt.indexOf("windows nt")!=-1)));
    var is_win32 = (is_win95 || is_win98 || is_winnt || is_win2k ||
                    ((is_major >= 4) && (navigator.platform == "Win32")) ||
                    (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1));

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

    var is_mac      = (agt.indexOf("mac")!=-1);
    var is_mac68k   = (is_mac && ((agt.indexOf("68k")!=-1) || 
                                  (agt.indexOf("68000")!=-1)));
    var is_macppc   = (is_mac && ((agt.indexOf("ppc")!=-1) || 
                                  (agt.indexOf("powerpc")!=-1)));

    var is_sun      = (agt.indexOf("sunos")!=-1);
    var is_sun4     = (agt.indexOf("sunos 4")!=-1);
    var is_sun5     = (agt.indexOf("sunos 5")!=-1);
    var is_suni86   = (is_sun && (agt.indexOf("i86")!=-1));
    var is_irix     = (agt.indexOf("irix") !=-1);    // SGI
    var is_irix5    = (agt.indexOf("irix 5") !=-1);
    var is_irix6    = ((agt.indexOf("irix 6") !=-1) || (agt.indexOf("irix6") !=-1));
    var is_hpux     = (agt.indexOf("hp-ux")!=-1);
    var is_hpux9    = (is_hpux && (agt.indexOf("09.")!=-1));
    var is_hpux10   = (is_hpux && (agt.indexOf("10.")!=-1));
    var is_aix      = (agt.indexOf("aix") !=-1);      // IBM
    var is_aix1     = (agt.indexOf("aix 1") !=-1);    
    var is_aix2     = (agt.indexOf("aix 2") !=-1);    
    var is_aix3     = (agt.indexOf("aix 3") !=-1);    
    var is_aix4     = (agt.indexOf("aix 4") !=-1);    
    var is_linux    = (agt.indexOf("inux")!=-1);
    var is_sco      = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1);
    var is_unixware = (agt.indexOf("unix_system_v")!=-1); 
    var is_mpras    = (agt.indexOf("ncr")!=-1); 
    var is_reliant  = (agt.indexOf("reliantunix")!=-1);
    var is_dec      = ((agt.indexOf("dec")!=-1) || (agt.indexOf("osf1")!=-1) || 
                       (agt.indexOf("dec_alpha")!=-1) || (agt.indexOf("alphaserver")!=-1) || 
                       (agt.indexOf("ultrix")!=-1) || (agt.indexOf("alphastation")!=-1)); 
    var is_sinix    = (agt.indexOf("sinix")!=-1);
    var is_freebsd  = (agt.indexOf("freebsd")!=-1);
    var is_bsd      = (agt.indexOf("bsd")!=-1);
    var is_unix     = ((agt.indexOf("x11")!=-1) || is_sun || is_irix || is_hpux || 
                       is_sco ||is_unixware || is_mpras || is_reliant || 
                       is_dec || is_sinix || is_aix || is_linux || is_bsd || is_freebsd);

    var is_vms   = ((agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1));


    // *** SOMETIMES USEFUL VARIABLES ***

    var bScripting = (is_nav3 || is_nav4up || is_ie4up || is_opera)
    var is_CSS_standards_compliant = (is_nav6up || is_ie6up || is_opera6up || (is_ie4up && is_mac));