/************************************************************************************************************
Ajax dynamic content
Copyright (C) 2006  DTHMLGoodies.com, Alf Magne Kalleland

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

Dhtmlgoodies.com., hereby disclaims all copyright interest in this script
written by Alf Magne Kalleland.

Alf Magne Kalleland, 2006
Owner of DHTMLgoodies.com
	
************************************************************************************************************/	



var enableCache = true;
var jsCache = new Array();

var dynamicContent_ajaxObjects = new Array();

function ajax_showContent(divId,ajaxIndex,url)
{
	document.getElementById(divId).innerHTML = dynamicContent_ajaxObjects[ajaxIndex].response;
	if(enableCache){
		jsCache[url] = 	dynamicContent_ajaxObjects[ajaxIndex].response;
	}
	dynamicContent_ajaxObjects[ajaxIndex] = false;
}

function sack(file){
		this.AjaxFailedAlert = "Your browser does not support the enhanced functionality of this website, and therefore you will have an experience that differs from the intended one.\n";
		this.requestFile = file;
		this.method = "POST";
		this.URLString = "";
		this.encodeURIString = true;
		this.execute = false;
	
		this.onLoading = function() { };
		this.onLoaded = function() { };
		this.onInteractive = function() { };
		this.onCompletion = function() { };
	
		this.createAJAX = function() {
			try {
				this.xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
			} catch (e) {
				try {
					this.xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
				} catch (err) {
					this.xmlhttp = null;
				}
			}
			if(!this.xmlhttp && typeof XMLHttpRequest != "undefined")
				this.xmlhttp = new XMLHttpRequest();
			if (!this.xmlhttp){
				this.failed = true; 
			}
		};
		
		this.setVar = function(name, value){
			if (this.URLString.length < 3){
				this.URLString = name + "=" + value;
			} else {
				this.URLString += "&" + name + "=" + value;
			}
		}
		
		this.encVar = function(name, value){
			var varString = encodeURIComponent(name) + "=" + encodeURIComponent(value);
		return varString;
		}
		
		this.encodeURLString = function(string){
			varArray = string.split('&');
			for (i = 0; i < varArray.length; i++){
				urlVars = varArray[i].split('=');
				if (urlVars[0].indexOf('amp;') != -1){
					urlVars[0] = urlVars[0].substring(4);
				}
				varArray[i] = this.encVar(urlVars[0],urlVars[1]);
			}
		return varArray.join('&');
		}
		
		this.runResponse = function(){
			eval(this.response);
		}
		
		this.runAJAX = function(urlstring){
			this.responseStatus = new Array(2);
			if(this.failed && this.AjaxFailedAlert){ 
				alert(this.AjaxFailedAlert); 
			} else {
				if (urlstring){ 
					if (this.URLString.length){
						this.URLString = this.URLString + "&" + urlstring; 
					} else {
						this.URLString = urlstring; 
					}
				}
				if (this.encodeURIString){
					var timeval = new Date().getTime(); 
					this.URLString = this.encodeURLString(this.URLString);
					this.setVar("rndval", timeval);
				}
				if (this.element) { this.elementObj = document.getElementById(this.element); }
				if (this.xmlhttp) {
					var self = this;
					if (this.method == "GET") {
						var totalurlstring = this.requestFile + "?" + this.URLString;
						this.xmlhttp.open(this.method, totalurlstring, true);
					} else {
						this.xmlhttp.open(this.method, this.requestFile, true);
					}
					if (this.method == "POST"){
						try {
							this.xmlhttp.setRequestHeader('Content-Type','application/x-www-form-urlencoded')  
						} catch (e) {}
					}
	
					this.xmlhttp.send(this.URLString);
					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;
								self.onCompletion();
								if(self.execute){ self.runResponse(); }
								if (self.elementObj) {
									var 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;
									}
								}
								self.URLString = "";
							break;
						}
					};
				}
			}
		};
	this.createAJAX();
	}

function ajax_loadContent(divId,url)
{
	if(enableCache && jsCache[url]){
		document.getElementById(divId).innerHTML = jsCache[url];
		return;
	}

	
	var ajaxIndex = dynamicContent_ajaxObjects.length;
	document.getElementById(divId).innerHTML = 'Loading content - please wait';
	dynamicContent_ajaxObjects[ajaxIndex] = new sack();
	
	if(url.indexOf('?')>=0){
		dynamicContent_ajaxObjects[ajaxIndex].method='GET';
		var string = url.substring(url.indexOf('?'));
		url = url.replace(string,'');
		string = string.replace('?','');
		var items = string.split(/&/g);
		for(var no=0;no<items.length;no++){
			var tokens = items[no].split('=');
			if(tokens.length==2){
				dynamicContent_ajaxObjects[ajaxIndex].setVar(tokens[0],tokens[1]);
			}	
		}	
		url = url.replace(string,'');
	}
	
	dynamicContent_ajaxObjects[ajaxIndex].requestFile = url;	// Specifying which file to get
	dynamicContent_ajaxObjects[ajaxIndex].onCompletion = function(){ ajax_showContent(divId,ajaxIndex,url); };	// Specify function that will be executed after file has been found
	dynamicContent_ajaxObjects[ajaxIndex].runAJAX();		// Execute AJAX function	
	
	
}