var ua = navigator.userAgent.toLowerCase();
var win = ua.indexOf("windows") != -1 ? true:false;
var ie = ua.indexOf("msie") != -1 ? true:false;
var opera = ua.indexOf("opera") != -1 ? true:false;

if (win && ie) {
	if (!opera) {
		document.write('<link rel="stylesheet" type="text/css" media="screen" href="css/screenWinIE.css">');
	}
}