var http_request = false;
var UserCallBack = false;
   
function makeRequest(url, POSTQuery, callback) {
		
	http_request = false;
	UserCallBack = callback;
				
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
		if (http_request.overrideMimeType) {
			http_request.overrideMimeType('text/xml');
		}
	} else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
		}
	}
	if (!http_request) {
		//alert('XMLHttpRequest Impossible');
		return false;
	}
	
	http_request.onreadystatechange = AjaxCallBack;
	http_request.open("POST", url, true);
	http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
	http_request.setRequestHeader("Content-length", POSTQuery.length);
	http_request.setRequestHeader("Connection", "close");
	http_request.send(POSTQuery);
	}
   
function AjaxCallBack() {

	if (http_request.readyState == 4) {
		if (http_request.status == 200) {
			eval( UserCallBack + "(http_request.responseText);");
		} else {
			eval( UserCallBack + "(false);");
		}
	}
}

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;
}

function decode64(input) {
	var output = "";
	var chr1, chr2, chr3 = "";
		var enc1, enc2, enc3, enc4 = "";
	var i = 0;

	// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
	var base64test = /[^A-Za-z0-9\+\/\=]/g;
	if (base64test.exec(input)) {
		 alert("There were invalid base64 characters in the input text.\n" +
			 "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
			 "Expect errors in decoding.");
	}
	input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

	do {
		 enc1 = keyStr.indexOf(input.charAt(i++));
		 enc2 = keyStr.indexOf(input.charAt(i++));
		 enc3 = keyStr.indexOf(input.charAt(i++));
		 enc4 = keyStr.indexOf(input.charAt(i++));

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

		 output = output + String.fromCharCode(chr1);

		 if (enc3 != 64) {
			output = output + String.fromCharCode(chr2);
		 }
		 if (enc4 != 64) {
			output = output + String.fromCharCode(chr3);
		 }

		 chr1 = chr2 = chr3 = "";
		 enc1 = enc2 = enc3 = enc4 = "";

	} while (i < input.length);

	return unescape(output);
}