function Is ()
{ 
var agt=navigator.userAgent.toLowerCase();
this.major = parseInt(navigator.appVersion);
this.minor = parseFloat(navigator.appVersion);
this.nav = ((agt.indexOf('mozilla')!=-1) && (agt.indexOf('spoofer')==-1)
&& (agt.indexOf('compatible') == -1) && (agt.indexOf('opera')==-1)
&& (agt.indexOf('webtv')==-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) ||
(agt.indexOf("; nav") != -1)) );
this.nav5 = (this.nav && (this.major == 5));
this.nav5up = (this.nav && (this.major >= 5));
this.ie = (agt.indexOf("msie") != -1);
this.ie3 = (this.ie && (this.major < 4));
this.ie4 = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")==-1) );
this.ie4up = (this.ie && (this.major >= 4));
this.ie5 = (this.ie && (this.major == 4) && (agt.indexOf("msie 5.0")!=-1) );
this.ie5up = (this.ie && !this.ie3 && !this.ie4);
this.aol = (agt.indexOf("aol") != -1);
this.aol3 = (this.aol && this.ie3);
this.aol4 = (this.aol && this.ie4);
this.opera = (agt.indexOf("opera") != -1);
this.webtv = (agt.indexOf("webtv") != -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.minor <= 4.05)) || this.ie4) this.js = 1.2
else if ((this.nav4 && (this.minor > 4.05)) || this.ie5) this.js = 1.3
else if (this.nav5) this.js = 1.4
else if (this.nav && (this.major > 5)) this.js = 1.4
else if (this.ie && (this.major > 5)) this.js = 1.3
else this.js = 0.0;
this.win = ( (agt.indexOf("win")!=-1) || (agt.indexOf("16bit")!=-1) );
this.win95 = ((agt.indexOf("win95")!=-1) || (agt.indexOf("windows 95")!=-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); 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); 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.bsd ||
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();