var appname = navigator.appName; 
var version = parseInt(navigator.appVersion); 

if (navigator.userAgent.lastIndexOf("Win") >= 0) { 
  var platform = "pc"; 

} 
else if (navigator.userAgent.lastIndexOf("Mac") >= 0) {
  var platform = "mac"; 
  
} 


////////////warn netscape 4.7 or lower & mac ie 4.5 or lower users

if (appname == "Netscape" && version <= 4.7) { 
  alert("In order to utilize the functionality of this site, please upgrade to the latest version of either Netscape or Internet Explorer.");

}

var agt=navigator.userAgent.toLowerCase();
var is_major = parseInt(navigator.appVersion);
var is_minor = parseFloat(navigator.appVersion);
var is_ie     = ((agt.indexOf("msie") != -1) && (agt.indexOf("opera") == -1));
var is_ie4x    = (is_ie && (is_major == 4) && (agt.indexOf("msie 4")!=-1) && (is_minor < 4.5));

if (is_ie && is_ie4x ){
	if (platform == "mac") {
	   alert("In order to utilize the functionality of this site, please upgrade to the latest version of either Netscape or Internet Explorer.");
	}
}
////////////

if ((appname == "Netscape" && version >= 3) || (appname == "Microsoft Internet Explorer" && version >= 3) ) { 
  if (platform == "pc") { 
   

  // ENTER THE PC STYLESHEET LINK HERE:
  var linkrel = "<link rel=\"stylesheet\" href=\"http://scil.stanford.edu/stylesheets/scil_pc.css\">"; 
}

  // ENTER THE MAC STYLESHEET LINK HERE:
else { 
  var linkrel = "<link rel=\"stylesheet\" href=\"http://scil.stanford.edu/stylesheets/scil_mac.css\">"; 
} 

document.write(linkrel); 

}