var sUserAgent = navigator.userAgent;
var fAppVersion = parseFloat(navigator.appVersion);


var bIsOpera = sUserAgent.indexOf("Opera") > -1;

var bIsIE = sUserAgent.indexOf("compatible") > -1
			&& sUserAgent.indexOf("MSIE") > -1
			&& !bIsOpera;
			

var bIsMinIE4 = bIsMinIE5 = bIsMinIE5_5 = bIsMinIE6 = bIsMinIE7 = false;

if(bIsIE) {
	var reIE = new RegExp("MSIE (\\d+\\.\\d+);");
	reIE.test(sUserAgent);
	var fIEVersion = parseFloat(RegExp["$1"]);
	
	bIsMinIE4 = fIEVersion >= 4;
	bIsMinIE5 = fIEVersion >= 5;
	bIsMinIE5_5 = fIEVersion >= 5.5;
	bIsMinIE6 = fIEVersion >= 6;
 	bIsMinIE7 = fIEVersion >= 7;
}