var isMinNS4 = (navigator.appName.indexOf("Netscape") >= 0 &&

                parseFloat(navigator.appVersion) >= 4) ? 1 : 0;

var isMinIE4 = (document.all) ? 1 : 0;

var isMinIE5 = (isMinIE4 && navigator.appVersion.indexOf("5.") >= 0) ? 1 : 0;


if(isMinNS4){
	document.write('<link rel="stylesheet" href="images/style_ns.css" type="text/css">');
}else{
	document.write('<link rel="stylesheet" href="images/style.css" type="text/css">');
}