var flag = uaCheck ();
if ( flag > 0 ) {
	document.write ( '<link href="css/base.css" type="text/css" rel="stylesheet" media="screen,print" />' );
	document.write ( '<link href="css/layout.css" type="text/css" rel="stylesheet" media="screen,print" />' );
}


function uaCheck () {
	var vcheck = navigator.appVersion.charAt(0);
	var ncheck = navigator.appName.charAt(0);
	var IE5 = navigator.userAgent.indexOf("MSIE 5")>=0;
	var NN = navigator.userAgent.indexOf("Netscape")>=0;
	var NN7 = navigator.userAgent.indexOf("Netscape/7")>=0;
	var Firefox = navigator.userAgent.indexOf("Firefox")>=0;
	var Mozilla = navigator.userAgent.indexOf("Mozilla")>=0;
	var Safari = navigator.userAgent.indexOf("Safari")>=0;
	var win = navigator.userAgent.indexOf("Win")>=0;
	var mac = navigator.userAgent.indexOf("Mac")>=0;

	var check;

	//windows
	if ( win == true ) {
		//IE
		if (( ncheck == "M" ) && ( vcheck >= 4 ) && ( IE5 == false )) { check = 1; }
		else if (( ncheck == "N" ) && ( vcheck >= 5 )) {
			//NN7
			if (( NN == true ) && ( NN7 == true )) { check = 1; }
			//Mozilla
			else if (( NN == false ) && ( Mozilla == true ) && ( Firefox == false )) { check = 1; }
			//Firefox
			else if (( NN == false ) && ( Mozilla == true ) && ( Firefox == true )) { check = 1; }
		}
		//Opera
		else if (( ncheck == "O" ) && ( vcheck >= 7 )) { check = 1; }
	}
	//macintosh
	else if ( mac == true ) {
		//IE
		if (( ncheck == "M" ) && ( vcheck >= 5 ) && ( Safari == false )) { check = 1; }
		else if (( ncheck == "N" ) && ( vcheck >= 5 )) {
			//NN7
			if (( NN == true ) && ( NN7 == true )) { check = 1; }
			//Mozilla
			else if (( NN == false ) && ( Mozilla == true ) && ( Firefox == false ) && ( Safari == false )) { check = 1; }
			//Firefox
			else if (( NN == false ) && ( Mozilla == true ) && ( Firefox == true ) && ( Safari == false )) { check = 1; }
			//Safari
			else if (( NN == false ) && ( Safari == true )) { check = 1; }
		}
		//Opera
		else if (( ncheck == "O" ) && ( vcheck >= 8 )) { check = 1; }
	}
	// other
	else {
		//IE
		if (( ncheck == "M" ) && ( vcheck >= 4 ) && ( IE5 == false )) { check = 1; }
		else if (( ncheck == "N" ) && ( vcheck >= 5 )) {
			//NN7
			if (( NN == true ) && ( NN7 == true )) { check = 1; }
			//Mozilla
			else if (( NN == false ) && ( Mozilla == true ) && ( Firefox == false )) { check = 1; }
			//Firefox
			else if (( NN == false ) && ( Mozilla == true ) && ( Firefox == true )) { check = 1; }
		}
		//Opera
		else if (( ncheck == "O" ) && ( vcheck >= 7 )) { check = 1; }
	}

	return check;
}