var Browser, Platform, Version;

// Browser
if(navigator.appVersion.indexOf("Safari") != -1)
	Browser = "SAFARI";
else if(navigator.appName.indexOf("Microsoft Internet Explorer") != -1)
	Browser = "IE";
else if(navigator.appName.indexOf("Netscape") != -1)
	Browser = "NN";
else
	Browser = null;

// Plaform
if(navigator.userAgent.indexOf("Win") != -1)
	Platform = "PC";
else if(navigator.userAgent.indexOf("Mac") != -1)
	Platform = "MAC";
else
	Platform = null;

// Version
if (navigator.appVersion.indexOf("MSIE")!=-1){
	temp=navigator.appVersion.split("MSIE")
	Version=parseFloat(temp[1])
} else {
	Version = parseFloat(navigator.appVersion)
}

var isNN = (Browser == "NN");
var isIE = (Browser == "IE");
var isSAFARI = (Browser == "SAFARI");
var isMozilla = (Browser == "NN" && Version >= 5);

var isMAC = (Platform == "MAC");
var isPC = (Platform == "PC");

var isVersion3 = (Version >= 3 && Version < 4);
var isVersion4 = (Version >= 4 && Version < 5);
var isVersion5 = (Version >= 5 && Version < 6);
var isVersion6 = (Version >= 6 && Version < 7);

var isIE4 = isIE && (Version == 4);

var isNN3 = isNN && (Version == 3);
var isIE3 = isIE && (Version == 3);

var isNN4 = isNN && (Version >= 4 && Version < 5);
var isIE4 = isIE && (Version == 4);

var isNN6 = isNN && (navigator.userAgent.indexOf("Netscape6") != -1);
var isNN7 = isNN && (navigator.userAgent.indexOf("Netscape/7") != -1);

var isDOM = (isNN && Version >= 5) || (isIE && Version >= 4) || (isSAFARI);

var isIE_PC = isIE && isPC;