function BrowserCheck() {
var b = navigator.appName
if (b=="Netscape") this.b = "ns"
else if (b=="Microsoft Internet Explorer") this.b = "ie"
else this.b = b
this.version = navigator.appVersion
this.v = parseInt(this.version)
this.ns =  (this.b=="ns" && this.v>=4)
this.ns4 = (this.b=="ns" && this.v==4)
this.ns5 = (this.b=="ns" && this.v==5)
this.ie =  (this.b=="ie" && this.v>=4)
this.ie4 = (this.version.indexOf('MSIE 4')>0)
this.ie5 = (this.version.indexOf('MSIE 5')>0)
this.ie6 = (this.version.indexOf('MSIE 6')>0)
this.ns6 = (navigator.userAgent.indexOf("Netscape") != -1)
this.moz = (navigator.userAgent.indexOf("Gecko") != -1 && navigator.userAgent.indexOf("Netscape") == -1 )
this.mac = (navigator.platform.indexOf("Mac") != -1)
this.win = (navigator.platform.indexOf("Win") != -1)
this.linux = (navigator.platform.indexOf("Linux") != -1)
//this.min = (this.ns||this.ie)
}
is = new BrowserCheck()

//var NS4 ="";
//var IE4 ="";
//NS4 = is.ns4;
//IE4 = is.ie4;
//var ver4 = (NS4 || IE4);
//var IE5 = is.ie5;
//var IE6 = is.ie6;
//var MOZ = is.moz;
//var isMac = is.mac;
//var isWin = is.win;
//var isLinux = is.linux;
//var ie, ns, ns4;
//ns =(is.ns);
//ns4 =(is.ns4);
//ie =(is.ie);

var Opsys
if      (is.mac)   Opsys = "mac"
else if (is.win)   Opsys = "pc"
else if (is.linux) Opsys = "linux"
else               Opsys = "?"

var Browser
if      (is.ns4) Browser = "ns4"
else if (is.ie4) Browser = "ie4"
else if (is.ie5) Browser = "ie5"
else if (is.ie6) Browser = "ie6"
else if (is.moz) Browser = "moz"
else if (is.ns5) Browser = "ns6"
else             Browser = "?"

var System = Opsys+Browser;