/* Simple AJAX Code-Kit (SACK) v1.6.1 */
/* ©2005 Gregory Wild-Smith */
/* www.twilightuniverse.com */
/* Software licenced under a modified X11 licence,
   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 = 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 = "";
														
														delete self.xmlhttp['onreadystatechange'];
														self.xmlhttp = null;
														self.responseStatus = null;
														self.response = null;
														self.responseXML = null;
																					
														break;
					        }
											}
				     };

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

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