function sack(file) {
	this.xmlhttp = null;

this.resetData = function() {
	this.method = "GET";
	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.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;
					}
					}
					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.runAJAX = function(urlstring) {
		if (this.failed) {
			this.onFail();
			} else {
				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) { }
									}
									
this.xmlhttp.onreadystatechange = function() {
	switch (self.xmlhttp.readyState) {
		case 1:
		self.onLoading();
		break;
		case 2:
		self.onLoaded();
		break;
		case 3:
		self.onInteractive();
		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;
				elemNodeName.toLowerCase();
				if (elemNodeName == "input"
					|| elemNodeName == "select"
					|| elemNodeName == "option"
					|| elemNodeName == "textarea") {
					self.elementObj.value = self.response;
					} else {
						self.elementObj.innerHTML = self.response;
						}
						}
						if (self.responseStatus[0] == "200") {
							self.onCompletion();
							} else {
								self.onError();
								}
								self.URLString = "";
								break;
								}
								};
								this.xmlhttp.send(this.URLString);
								}
								}
								};
								this.reset();
								this.createAJAX();
								}