var detect = navigator.userAgent.toLowerCase();
var os,br;

function checkIt(string)
{
	place = detect.indexOf(string) + 1;
	thestring = string;
	return place;
}

if (checkIt('win')) os = "Windows";
else if (checkIt('mac')) os = "Mac";
else if (checkIt('x11')) os = "Unix";
else if (checkIt('linux')) os = "Linux";

if(document.layers && os!="Mac"){br="ns4";}
if(document.layers && os=="Mac"){br="mcns4";}
if(document.getElementById && !document.all && os!="Mac"){br="ns6";}
if(document.styleSheets && document.all && os!="Mac"){br="ie4";}
if(document.styleSheets && document.all && os=="Mac" && !document.getElementById){br="mcie4";}
if(document.styleSheets && document.all && os=="Mac" && (checkIt('4.5'))){br="mcie45";}
if(document.styleSheets && document.all && os=="Mac" && document.getElementById){br="mcie5";}
//if(document.getElementById && document.all){br="ie5";}
//if(document.all && !document.styleSheets){br="op";}
//if(document.getElementById && !document.styleSheets){br="op5";}