<!--
// (c) 2005 Gregory Wild-Smith

function sack(file) {
	this.xmlhttp = 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.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() {
		var agent = navigator.userAgent.toLowerCase();
		var is_ie = ((agent.indexOf('msie') != -1) && (agent.indexOf('opera') == -1));
		this.xmlhttp = null;

		if (is_ie) {
			try {
				this.xmlhttp = new ActiveXObject('Msxml2.XMLHTTP');
			}
			catch (e1) {
				try {
					this.xmlhttp = new ActiveXObject('Microsoft.XMLHTTP');
				}
				catch (e2) {
					this.xmlhttp = null;
				}
			}
		}
		else {
			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.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();
}
//-->