function Is (){   
	var agt=navigator.userAgent.toLowerCase();
	var apv=navigator.appVersion;
	// Detect browser version
	this.major = parseInt(apv);
	this.minor = parseFloat(apv);
	// Detect browser type
	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.nav3up = (this.nav && (this.major >= 3));
	this.nav4 = (this.nav && (this.major == 4));
	this.nav4up = this.nav && (this.major >= 4);
	this.nav5 = (this.nav && (this.major == 5));
	this.nav5up = (this.nav && (this.major >= 5));
	this.navonly  = (this.nav && ((agt.indexOf(";nav") != -1) || (agt.indexOf("; nav") != -1)));

	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);

	// Low level javascript (ie3.02)
	this.low = (!this.nav && !this.ie && !this.opera) ? true:false
     
	// Detect Javascript version
	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) || (apv.indexOf("OS/2")!=-1) || (apv.lastIndexOf("OS2") != -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.bsd || this.freebsd);
	this.vms   = ((agt.indexOf("vax")!=-1) || (agt.indexOf("openvms")!=-1));
	this.rhapsody = (agt.indexOf("rhapsody") != -1 );
	this.openstep = (agt.indexOf("openstep") != -1 );
	this.nextos =  (agt.indexOf("next") != -1);
	this.solaris = (agt.indexOf("solaris") != -1);
}
Is = new Is();