if (navigator.userAgent.indexOf("Gecko") != -1)
		document.write ("<link href=\"style/mainG.css\" type=\"text/css\" rel=stylesheet media=\"screen\"/>");
else if ((navigator.appVersion.indexOf("Mac") != -1) && (navigator.appVersion.indexOf("MSIE 5") != -1))
		document.write ("<link href=\"style/mainEM.css\" type=\"text/css\" rel=stylesheet media=\"screen\"/>");
else if (navigator.userAgent.indexOf("IE 5.0") != -1)
		document.write ("<link href=\"style/mainEW50.css\" type=\"text/css\" rel=stylesheet media=\"screen\"/>");
else if (navigator.userAgent.indexOf("IE 5.") != -1)
		document.write ("<link href=\"style/mainEW55.css\" type=\"text/css\" rel=stylesheet media=\"screen\"/>");
else if (navigator.userAgent.indexOf("Opera") != -1)
		document.write ("<link href=\"style/mainO.css\" type=\"text/css\" rel=stylesheet media=\"screen\"/>");