var stylemac = '../css/mac.css';		//mac
var styleWinIE = '../css/win_ie.css';	//win_ie
var styleWinNN = '../css/win_nn.css';	//win_nn

	if (!navigator.platform.match(/win/i)){

		var style = stylemac;

	}else{

	if (navigator.appName.match(/microsoft/i)){

		var style = styleWinIE;

	}else{

		var style = styleWinNN;

		}
	}
	document.write('<link rel="stylesheet" href="'+style+'" type="text/css">');