var ua= navigator.userAgent;
var opera= /opera [56789]|opera\/[56789]/i.test(ua);
var ie= !opera && /msie [56789]/i.test(ua);// preventing opera to be identified as ie
var moz= !opera && /mozilla\/[56789]/i.test(ua);// preventing opera to be identified as mz

if (ie && !opera){
	document.write('<script type="text/javascript" src="js/cssexpr.js"></script>');
}