// set Variable
	var cssDir = 'css/';
	var cssTags = '<link rel="stylesheet" type="text/css" href="';
	var flag = null;
	var ns6 = document.getElementById ? 1 : 0;


// Check Browsers
	if (document.all || ns6) { // check IE and NS6
		flag = "ie";
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="IE_style">');
		document.close();
	} else { // for Other Netscape
		flag = "ns_c1";
		document.open();
		document.write(cssTags + cssDir + flag + '.css" title="NS_style">');
		document.close();
	}

// for debug
/*
alert(flag);
*/