function Is ()
{  
    var agt=navigator.userAgent.toLowerCase()

    this.major = parseInt(navigator.appVersion)

    this.nav  = ((agt.indexOf('mozilla')!=-1) && ((agt.indexOf('spoofer')==-1) && (agt.indexOf('compatible') == -1)))
    this.nav2 = (this.nav && (this.major == 2))
    this.nav3 = (this.nav && (this.major == 3))
    this.nav4 = (this.nav && (this.major == 4))
    this.nav4up = this.nav && (this.major >= 4)
    this.navonly = (this.nav && (agt.indexOf(";nav") != -1))

    this.ie   = (agt.indexOf("msie") != -1)
    this.ie3  = (this.ie && (this.major == 2))
    this.ie4  = (this.ie && (this.major == 4))
    this.ie5  = (this.ie && (this.major == 5))
    this.ie4up  = this.ie  && (this.major >= 4)

    this.opera = (agt.indexOf("opera") != -1)

function splitString (stringToSplit,separator) 
{   
arrayOfStrings = stringToSplit.split(separator)   
}

    this.minor = parseFloat(navigator.appVersion)

if (this.ie)
{
   var spacer="msie "
   splitString(agt,spacer)
   this.minor = parseFloat(arrayOfStrings[1])
}
     
    if (this.nav2 || this.ie3) this.js = 1.0
    else if (this.nav3 || this.opera) this.js = 1.1
    else if (this.nav4 || this.ie4 || this.ie5) this.js = 1.2
    else if ((this.nav && (this.minor > 4.05)) || (this.ie && (this.major > 4))) 
    this.js = 1.2
    else this.js = 0.0 

    this.win   = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1)
)
    this.win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows95")!=-1))
    this.win16 = ((agt.indexOf("win16")!=-1) || (agt.indexOf("16bit")!=-1) || (agt.indexOf("windows 3.1")!=-1) || (agt.indexOf("windows 16-bit")!=-1))  
    this.win31 = (agt.indexOf("windows 3.1")!=-1) || (agt.indexOf("win16")!=-1) || (agt.indexOf("windows 16-bit")!=-1)
    this.win98 = ((agt.indexOf("win98")!=-1)||(agt.indexOf("windows 98")!=-1))
    this.winnt = ((agt.indexOf("winnt")!=-1)||(agt.indexOf("windows nt")!=-1))
    this.win32 = this.win95 || this.winnt || this.win98 || ((this.major >= 4) && (navigator.platform == "Win32")) || (agt.indexOf("win32")!=-1) || (agt.indexOf("32bit")!=-1)
    this.os2   = (agt.indexOf("os/2")!=-1) || (navigator.appVersion.indexOf("OS/2")!=-1) || (agt.indexOf("ibm-webexplorer")!=-1)
    this.mac    = (agt.indexOf("mac")!=-1)
    this.mac68k = this.mac && ((agt.indexOf("68k")!=-1) || (agt.indexOf("68000")!=-1))
    this.macppc = this.mac && ((agt.indexOf("ppc")!=-1) || (agt.indexOf("powerpc")!=-1))
    this.sun   = (agt.indexOf("sunos")!=-1)
    this.sun4  = (agt.indexOf("sunos 4")!=-1)
    this.sun5  = (agt.indexOf("sunos 5")!=-1)
    this.suni86= this.sun && (agt.indexOf("i86")!=-1)
    this.irix  = (agt.indexOf("irix") !=-1)    // SGI
    this.irix5 = (agt.indexOf("irix 5") !=-1)
    this.irix6 = ((agt.indexOf("irix 6") !=-1) || (agt.indexOf("irix6") !=-1))
    this.hpux  = (agt.indexOf("hp-ux")!=-1)
    this.hpux9 = this.hpux && (agt.indexOf("09.")!=-1)
    this.hpux10= this.hpux && (agt.indexOf("10.")!=-1)
    this.aix   = (agt.indexOf("aix")  !=-1)      // IBM
    this.aix1  = (agt.indexOf("aix 1")  !=-1)    
    this.aix2  = (agt.indexOf("aix 2")  !=-1)    
    this.aix3  = (agt.indexOf("aix 3")  !=-1)    
    this.aix4  = (agt.indexOf("aix 4")  !=-1)    
    this.linux = (agt.indexOf("inux")!=-1)
    this.sco   = (agt.indexOf("sco")!=-1) || (agt.indexOf("unix_sv")!=-1)
    this.unixware = (agt.indexOf("unix_system_v")!=-1) 
    this.mpras    = (agt.indexOf("ncr")!=-1) 
    this.reliant  = (agt.indexOf("reliantunix")!=-1)
    this.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) 
    this.sinix = (agt.indexOf("sinix")!=-1)
    this.freebsd = (agt.indexOf("freebsd")!=-1)
    this.bsd = (agt.indexOf("bsd")!=-1)
    this.unix  = (agt.indexOf("x11")!=-1) || this.sun || this.irix || this.hpux || this.sco ||this.unixware || this.mpras || this.reliant || this.dec || this.sinix || this.aix || this.linux || this.freebsd
    this.vms   = (agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1)
}

var is;
var isIE3Mac = false;
if ((navigator.appVersion.indexOf("Mac")!=-1) &&
(navigator.userAgent.indexOf("MSIE")!=-1) &&
(parseInt(navigator.appVersion)==3))
isIE3Mac = true;
else 
is = new Is(); 
//-->