/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* (c) 2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licensed under a modified X11 license,
   see documentation or authors website for more details */

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 = OnAjaxComplete;
		this.onError = OnAjaxError;
		this.onFail = function(x) {}
	}

	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.runAJAX = function(urlstring)
	{
		if (this.failed)
			this.onFail(this);
		else
		{
			this.createURLString(urlstring);
			if (this.element)
				this.elementObj = document.getElementById(this.element);
			if (this.xmlhttp)
			{
				var pbar = document.getElementById('loadingProgressBar');
				if (pbar)
					pbar.style.display = '';

				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:
						pbar = document.getElementById('loadingProgressBar');
						if (pbar)
							pbar.style.display = 'none';

						try { self.response = self.xmlhttp.responseText; } catch(e) { self.response = ''; }
						try { self.responseXML = self.xmlhttp.responseXML; } catch(e) { self.responseXML = ''; }
						try { self.responseStatus[0] = self.xmlhttp.status;  } catch(e) { self.responseStatus[0] = 0; }
						try { self.responseStatus[1] = self.xmlhttp.statusText;  } catch(e) { self.responseStatus[1] = ''; }
						
						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(self);
						}
						else
						{
							self.onError(self);
						}

						self.URLString = "";
						break;
					}
				}

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

	this.reset();
	this.createAJAX();
	this.setVar('transferMode', 'ajax');
}

function OnAjaxComplete(obj)
{
	if (obj.targetDiv)
		obj.targetDiv.innerHTML = obj.response;
	else
		alert('AJAX Error: Target DIV not set.');
}

function OnAjaxError(obj)
{
	if (obj.targetDiv)
		obj.targetDiv.innerHTML = '';
	alert('AJAX error: ' + obj.responseStatus[0] + ' ' + obj.responseStatus[1]);
}