if (navigator.appName == 'Microsoft Internet Explorer') 
     document.write('<link rel=stylesheet href=include/css/default.css>')
     //location.href = 'index.html';
 else if (navigator.appName == 'Netscape') 
     //location.href = 'index.html';
     document.write('<link rel=stylesheet href=include/css/netscape.css>')
 else
     document.write('<link rel=stylesheet href=include/css/default.css>');