var name = navigator.appName;
var vers = navigator.appVersion;
vers = vers.substring(0,1);


if(name == "Netscape" && vers == "4") 
document.write('<LINK REL="STYLESHEET" TYPE="text/css" HREF="ns4-7.css">')
else 
document.write('<LINK REL="STYLESHEET" TYPE="text/css" HREF="ie5.css">');