function getReferrer(sid, main_site) {
	var sid = sid;
	var main_site = main_site;
	if (document.referrer&&document.referrer!="") {
		var str=document.referrer;
		var str_uni = encode64(str);
	}
	else {var str_uni = '_DirectRequest_';}
	return window.document.getElementById("link").src =  main_site+"/__trail_"+sid+"__"+str_uni;
}

// This code was written by Tyler Akins and has been placed in the
// public domain. It would be nice if you left this header intact.
// Base64 code from Tyler Akins -- http://rumkin.com

var keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";

function encode64(input) {
 var output = "";
 var chr1, chr2, chr3;
 var enc1, enc2, enc3, enc4;
 var i = 0;

 do {
 chr1 = input.charCodeAt(i++);
 chr2 = input.charCodeAt(i++);
 chr3 = input.charCodeAt(i++);

 enc1 = chr1 >> 2;
 enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
 enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
 enc4 = chr3 & 63;

 if (isNaN(chr2)) {
 enc3 = enc4 = 64;
 } else if (isNaN(chr3)) {
 enc4 = 64;
 }

 output = output + keyStr.charAt(enc1) + keyStr.charAt(enc2) +
 keyStr.charAt(enc3) + keyStr.charAt(enc4);
 } while (i < input.length);

 return output;
}