var base64		= {
 charmap		: "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",
 encode			: function(str) {
  var ret		= "";
  var c, i, acc		= 0;
  var div		= 1;
  for(i=0,c=0;i<str.length;i++,c++) {
   acc			= acc*256 + str.charCodeAt(i);
   div			= div*4;
   ret			= ret + base64.charmap.charAt(parseInt(acc/div));
   acc			= acc % div;
   if(div==64) ret	= ret + base64.charmap.charAt(parseInt(acc)), acc = 0, div = 1,c++;
   if(c>=75) c=-1, ret	= ret + "\n";
  } if(i%3) {
   ret			= ret + base64.charmap.charAt(parseInt(acc*((i%3==1)?16:4)));
   ret			= ret + ((i%3)==1?"==":"=");
  } return ret;
 },
 decode			: function(str) {
  var ret		= "";
  var i, acc		= 0;
  var div		= 1;
  for(i=0;i<str.length;i++) {
   if(str.charAt(i)=="=" || str.charAt(i)=='\n') break;
   acc			= acc*64 + base64.charmap.indexOf(str.charAt(i));
   div			= (div==1?64:div/4);
   if(div!=64) {
    ret			= ret + String.fromCharCode(parseInt(acc/div));
    acc			= acc % div;
   }
  } return ret;
 }
}

function sack(file) {
	this.xmlhttp = null;
	this.stop = false;
	
	var auth = null;

	this.resetData = function() {
		this.method = "POST";
  		this.queryStringSeparator = "?";
		this.argumentSeparator = "&";
		this.URLString = "";
		this.encodeURIString = true;
  		this.execute = false;
  		this.element = null;
		this.elementObj = null;
		this.requestFile = file;
		this.vars = new Object();
		this.responseStatus = new Array(2);
		this.stop = false;
		this.auth = null;
  	};

	this.resetFunctions = function() {
  		this.onLoading = function() { };
  		this.onLoaded = function() { };
  		this.onInteractive = function() { };
  		this.onCompletion = function() { };
  		this.onError = function() { };
		this.onFail = function() { };
	};

	this.reset = function() {
		this.resetFunctions();
		this.resetData();
	};

	this.createAJAX = function() {
		try {
			this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e1) {
			try {
				this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e2) {
				this.xmlhttp = null;
			}
		}

		if (! this.xmlhttp) {
			if (typeof XMLHttpRequest != "undefined") {
				this.xmlhttp = new XMLHttpRequest();
			} else {
				this.failed = true;
			}
		}
	};

	this.setVar = function(name, value){
		this.vars[name] = Array(value, false);
	};

	this.encVar = function(name, value, returnvars) {
		if (true == returnvars) {
			return Array(encodeURIComponent(name), encodeURIComponent(value));
		} else {
			this.vars[encodeURIComponent(name)] = Array(encodeURIComponent(value), true);
		}
	}

	this.processURLString = function(string, encode) {
		encoded = encodeURIComponent(this.argumentSeparator);
		regexp = new RegExp(this.argumentSeparator + "|" + encoded);
		varArray = string.split(regexp);
		for (i = 0; i < varArray.length; i++){
			urlVars = varArray[i].split("=");
			if (true == encode){
				this.encVar(urlVars[0], urlVars[1]);
			} else {
				this.setVar(urlVars[0], urlVars[1]);
			}
		}
	}
	
	this.createURLString = function(urlstring) {
		if (this.encodeURIString && this.URLString.length) {
			this.processURLString(this.URLString, true);
		}

		if (urlstring) {
			if (this.URLString.length) {
				this.URLString += this.argumentSeparator + urlstring;
			} else {
				this.URLString = urlstring;
			}
		}

		// prevents caching of URLString
		this.setVar("rndval", new Date().getTime());

		urlstringtemp = new Array();
		for (key in this.vars) {
			if (false == this.vars[key][1] && true == this.encodeURIString) {
				encoded = this.encVar(key, this.vars[key][0], true);
				delete this.vars[key];
				this.vars[encoded[0]] = Array(encoded[1], true);
				key = encoded[0];
			}

			urlstringtemp[urlstringtemp.length] = key + "=" + this.vars[key][0];
		}
		if (urlstring){
			this.URLString += this.argumentSeparator + urlstringtemp.join(this.argumentSeparator);
		} else {
			this.URLString += urlstringtemp.join(this.argumentSeparator);
		}
	}

	this.runResponse = function() {
		eval(this.response);
	};
	
	this.stopRun = function() {
		this.stop = true;
	};
	
	this.setAuth = function(user,pass) {
		if ((user.length > 0)&&(pass.length > 0))
		{
			auth =  "Basic "+base64.encode(user+":"+pass);
		}
	};

	this.runAJAX = function(urlstring) {
		if (this.failed) {
			this.onFail(self);
		} else {
			this.stop = false;
			this.createURLString(urlstring);
			if (this.element) {
				this.elementObj = document.getElementById(this.element);
			}
			if (this.xmlhttp) {
				var self = this;
				if (this.method == "GET") {
					totalurlstring = this.requestFile + this.queryStringSeparator + this.URLString;
					this.xmlhttp.open(this.method, totalurlstring, true);
				} else {
					this.xmlhttp.open(this.method, this.requestFile, true);
					try {
						this.xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded")
					} catch (e) { }
				}
				if (auth != null)
				{
					try {
						this.xmlhttp.setRequestHeader("Authorization",auth);
					} catch(e) {
						alert("There was an error setting the authentication headers");
						}
				}

				this.xmlhttp.onreadystatechange = function() {
					if (self.stop)
					{
						if (self.xmlhttp.readyState == 4)
							self.stop = false;
					}
					else
					{
						switch (self.xmlhttp.readyState) {
							case 1:
								self.onLoading(self);
								break;
							case 2:
								self.onLoaded(self);
								break;
							case 3:
								self.onInteractive(self);
								break;
							case 4:
								self.response = self.xmlhttp.responseText;
								self.responseXML = self.xmlhttp.responseXML;
								self.responseStatus[0] = self.xmlhttp.status;
								self.responseStatus[1] = self.xmlhttp.statusText;

								if (self.execute) {
									self.runResponse();
								}

								if (self.elementObj) {
									elemNodeName = self.elementObj.nodeName.toLowerCase();
									if (elemNodeName == "input"
									|| elemNodeName == "select"
									|| elemNodeName == "option"
									|| elemNodeName == "textarea") {
										self.elementObj.value = self.response;
									} else if (elemNodeName == "img") {
										var ext = self.requestFile.substr(self.requestFile.lastIndexOf(".")+1);
										if ((ext == "jpg")||(ext == "gif")||(ext == "png")||(ext = "jpeg"))
										{
											if (ext == "jpg")
												ext = "jpeg";
											
											self.elementObj.src = "data:image/"+ext+";base64,"+base64.encode(self.response);
										}
									} else {
										self.elementObj.innerHTML = self.response;
									}
								}
								if (self.responseStatus[0] == "200") {
									self.onCompletion(self);
								} else {
									self.onError(self);
								}

								self.URLString = "";
								break;
						}
					}
				};

				this.xmlhttp.send(this.URLString);
			}
		}
	};

	this.reset();
	this.createAJAX();
}