var isCSS = false;
var isW3C = false;
var isIE4 = false;
var isNN4 = false;
var isIE6 = false;
var isGecko = false;
var isOpera = false;
var isDHTML = false;
var suppressMenus = false;
var legacyMode = false;
var timerID = null;
var subtimerID = null;
var m_anchorClicked = false;

function ChkBrowser(){
	if( document && document.images ){
		isCSS = (document.body && document.body.style) ? true : false;
		isW3C = (isCSS && document.getElementById) ? true : false;
		isIE4 = (isCSS && document.all && readIEVer() >= 4.0) ? true : false;
		isNN4 = (document.layers) ? true : false;
		isGecko = (isCSS && navigator && navigator.product && navigator.product == "Gecko");
		isOpera = (isCSS && navigator.userAgent.indexOf( "Opera") != -1 );
		isIE6CSS = (document.compatMode && document.compatMode.indexOf("CSS1") >= 0) ? true : false;
		isIE6 = ( isIE6CSS && readIEVer() >= 6.0 );
		isDHTML = isCSS && ( isIE4 || isGecko || isOpera );
		//alert("isCSS = " + isCSS + "\nisIE4 = " + isIE4 +"\nisGecko = " + isGecko + "\nisOpera = " + isOpera);
		//alert(isDHTML ? "isDHTML starts off false, and after the first check is true" : "isDHTML starts off false, and after the first check is false");
		if( suppressMenus ){
			isDHTML = false;
			//alert("suppressMenus is on; isDHTML is set to false");
		}else if( isOpera && readOperaVer() < 7 ){
			//alert("Older version of Opera; isDHTML is set to false");
			isDHTML = false;
		}else if( isGecko && navigator.productSub <= 20011022 ){
			//alert("Older version of Gecko; isDHTML is set to false");
			isDHTML = false;
		}else if( isGecko && navigator.productSub == 20030107 ){
			var x = navigator.userAgent.indexOf( "AppleWebKit" );
			if( x > -1 ){
				isDHTML = ( navigator.userAgent.substring( x + 12, x + 15 ) ) > 300;
				//alert("Older version of AppleWebKit; isDHTML is set to " + isDHTML ? "true" : "false");
			}else{
				//alert("Older version of AppleWebKit; isDHTML is set to false");
				isDHTML = false;
			}
		}
	}
}

function readIEVer(){
	var agent = navigator.userAgent;
	var offset = agent.indexOf( "MSIE" );
	if( offset < 0 ){
		return 0;
	}
	return parseFloat( agent.substring( offset + 5, agent.indexOf( ";", offset ) ) );
}

function readOperaVer(){
	var agent = navigator.userAgent;
	var offset = agent.indexOf( "Opera" );
	if( offset < 0 ){
		return 0;
	}
	return parseFloat( agent.substring( offset + 6 ) );
}