var bHTML3 = false;
var bHTML4 = false; 
var bIE = false;
var bNS = false;
function mirarnavegador(){
	bIE = false;
	var bIE3 = false, bIE4 = false, bIE4_beta = false;
	var bIE4_01 = false, bIE5 = false;
	bNS = false;
	var bNS_2 = false, bNS_3 = false, bNS_4 = false;
    var sBrowserInfo = navigator.userAgent;
    var sBrowserName = navigator.appName;
    var sBrowserVer;
    bIE = (sBrowserInfo.indexOf("MSIE")>=1);
    if (bIE){
        bIE3 = (sBrowserInfo.indexOf("MSIE 3.") >= 1);
        if(bIE3){
			bHTML3 = true;
			return("IE");}
        var iMSIE4 = sBrowserInfo.indexOf("MSIE 4.");
        bIE4 = (iMSIE4 >= 1);
        if(bIE4){
			bHTML4 = true;
            var sMinorVer = sBrowserInfo.charAt(iMSIE4 + 8);
            bIE4_beta = ((sMinorVer == "b") || (sMinorVer == "p"));
            if (bIE4_beta)
				{return("IE")};
            bIE4_01 = (sMinorVer == "1");
            if (bIE4_01){
					return("IE")};
			return("IE");
        }
        bIE5 = (sBrowserInfo.indexOf("MSIE 5.") >= 1);
        if (bIE5){
				return("IE")};
	};
	if (sBrowserName == "Netscape"){   
    	bNS = true;
        sBrowserVer = parseInt(navigator.appVersion);
        if (sBrowserVer >= 4){
			bHTML4 = true;
			return("NS");
			}
        else{
			 if (sBrowserVer >= 3){
				bHTML3 = true;
				return("NS");
				}
	        else{
				return("NS")
				};
			}
    };
	return("IE");
}