ie4 = ((navigator.appName == "Microsoft Internet Explorer") &&
           (parseInt(navigator.appVersion) >= 4 ))
                        
ns = ((navigator.appName == "Netscape") &&
           (parseInt(navigator.appVersion) >= 5 ))

ns4 = ((navigator.appName == "Netscape") &&
           (parseInt(navigator.appVersion) < 5 ))

moz = ((navigator.appName == "Gecko") &&
           (parseInt(navigator.appVersion) >= 1 ))
           

if(ns4) {
        document.write("<link rel=stylesheet type='text/css' href='stylesns4.css'>");
} 
	else if(ns) {
        document.write("<link rel=stylesheet type='text/css' href='stylesns.css'>");
} 
	else if(moz) {
        document.write("<link rel=stylesheet type='text/css' href='stylesmoz.css'>");
} 
	else {
		document.write("<link rel=stylesheet type='text/css' href='stylesie.css'>");
}