// JavaScript Document

/* ObjectSwap - Bypasses the new ActiveX Activation requirement in Internet Explorer by swapping existing ActiveX objects on the page with the same objects. Can also be used for Flash version detection by adding the param:
<param name="flashVersion" value="8" /> to the object tag.

Author: Karina Steffens, www.neo-archaic.net
Created: April 2006
Changes History:
May 2006 - Changes and bug fixes
June 2006 - Bug fixes 
October 2006 - Included Opera9 and excluded IE5.5
July 2007 - OOP version, replaced window.onload with dom event listeners
Feb 2008 - Fixed new IE bug that requires the ActiveX object created to correspond to the exact flash version
*/


//Define the namespace
var neoarchaic;
if (neoarchaic == undefined){
	neoarchaic = {}
}

//Define the ObjectSwap class constructor and prototype functions
neoarchaic.ObjectSwap = function(){
	//Check if the browser is InternetExplorer, and if it supports the getElementById DOM method
	var ie = (document.defaultCharset && document.getElementById && !window.home);
	var opera9 = false;
	if (ie){
		//Check for ie 5.5 and exclude it from the script
		var ver=navigator.appVersion.split("MSIE")
		ver=parseFloat(ver[1])
		ie = (ver >=6)
	}else if (navigator.userAgent.indexOf("Opera")!=-1) {
		//Check for Opera9 or higher and include it in the ObjectSwap
		var versionindex=navigator.userAgent.indexOf("Opera")+6
		var verint=parseInt(navigator.userAgent.charAt(versionindex));
		if (verint==9 || verint == 1){
			opera9 = true;
		}
	}
	//Perform ObjectSwap if the browser is IE or Opera (if not just check flashVersion)
	this.oswap = (ie || opera9);
	this.ie = ie;
	
	//Hide the object to prevent it from loading twice
	if (this.oswap){
		document.write ("<style id='hideObject'> object{display:none;} </style>");
	}
	this.addLoadEvents()
}

//Add window load events to the ObjectSwap prototype
//The init function will be called multiple times, but only executed once 
neoarchaic.ObjectSwap.prototype.addLoadEvents = function(){
	if (document.addEventListener){
		//Firefox and other browsers that support addEventListener/DOMContentLoaded
		this.addEvent(document, "DOMContentLoaded", "init")
	}else{
		//IE - supports readystatechange event
		this.addEvent(document, "readystatechange", "init")
	}
	//Catch-all for browsers that don't support either
	this.addEvent(window, "load", "init")
}

//Register an event with a listener. Default listner is the current object
//Event will be registered depending on browser capabilities
neoarchaic.ObjectSwap.prototype.addEvent = function(obj, evType, fn, listener){ 
     //Assign this as default listener
	 if (listener == undefined){
	 	listener = this;
	 }
	 //Create a function that will execute the event in the scope of this object
	 //Pass a custom event object including target and type will be passed to the function 
	 var e = {target: obj, type:evType}
	 this["handle"+fn] = function(){
		 listener[fn](e); 
	 }	 
	  var handlefn = this["handle"+fn]
	 if (obj.addEventListener){
	   //Firefox, Safari, Opera, etc.
	   obj.addEventListener(evType, handlefn, false); 
	   return true; 
	 } else if (obj.attachEvent){
	   //IE
	   var r = obj.attachEvent("on"+evType, handlefn); 
	   return r; 
	 } else { 
	   return false; 
	 } 
}


/*Replace all flash objects on the page with the same flash object, 
by rewriting the outerHTML values
This bypasses the new IE ActiveX object activation issue*/
neoarchaic.ObjectSwap.prototype.init = function(){
	//only execute this function once
	if (this.isInit) return;
	this.isInit = true;
	if (!document.getElementsByTagName){
		return;
	}
	//An array of ids for flash detection
	var stripQueue = [];
	//Get a list of all ActiveX objects
	var objects = document.getElementsByTagName('object');
	for (var i=0; i<objects.length; i++){			
		var o = objects[i];	
		var h = o.outerHTML;
		//The outer html omits the param tags, so we must retrieve and insert these separately
		var params = "";
		this.hasFlash = true;
		for (var j = 0; j<o.childNodes.length; j++) {
			var p = o.childNodes[j];
			if (p.tagName == "PARAM"){
				//Check for version first - applies to all browsers
				//For this to work, a new param needs to be included in the object with the name "flashVersion" eg:
				//<param name="flashVersion" value="7" />
				if (p.name == "flashVersion"){
					this.hasFlash = this.detectFlash(p.value);
					if (!this.hasFlash){
						//Add the objects id to the list (create a new id if there's isn't one already)
						o.id = (o.id == "") ? ("stripFlash"+i) : o.id;
						stripQueue.push(o.id);
						break;
					}
				} 
				params += p.outerHTML;		       
			}
		}	
		if (!this.hasFlash){
			continue;
		}		
		//Only target internet explorer
		if (!this.oswap){
			continue;
		} 
		//Avoid specified objects, marked with a "noswap" classname
		if (o.className.toLowerCase().indexOf ("noswap") != -1){
			continue;
		}		
		//Get the tag and attributes part of the outer html of the object
		var tag = h.split(">")[0] + ">";			
		//Add up the various bits that comprise the object:
		//The tag with the attributes, the params and it's inner html
		var newObject = tag + params + o.innerHTML + " </OBJECT>";	
		//And rewrite the outer html of the tag 
		o.outerHTML = newObject;
	}
	//Strip flash objects
	if (stripQueue.length) {
		this.stripFlash(stripQueue);
	}
	//Make the objects visible again
	if (this.oswap){
		document.getElementById("hideObject").disabled = true;
	}
}

neoarchaic.ObjectSwap.prototype.detectFlash = function(version){
	if(navigator.plugins && navigator.plugins.length){
		//Non-IE flash detection.
		var plugin = navigator.plugins["Shockwave Flash"];
		if (plugin == undefined){
			return false;
		}
		var ver = navigator.plugins["Shockwave Flash"].description.split(" ")[2];
		return (Number(ver) >= Number(version))
	} else if (this.ie && typeof (ActiveXObject) == "function"){
	//IE flash detection.
		//Try 3 versions higher than specified	
		var maxCount = Number(version) + 3;
		for(var i=version; i<=maxCount; i++){
			try{
				var flash = new ActiveXObject("ShockwaveFlash.ShockwaveFlash." + i);
				return true;
			}
			catch(e){
				//continue			
			}
		}
		return false;
	}
	//Catchall - skip detection
	return true;
}

//Loop through an array of ids to strip
//Replace the object by a div tag containing the same innerHTML.
//To display an alternative image, message for the user or a link to the flash installation page, place it inside the object tag.  
//For the usual object/embed pairs it needs to be enclosed in comments to hide from gecko based browsers.
neoarchaic.ObjectSwap.prototype.stripFlash = function (stripQueue){
	if (!document.createElement){
		return;
	}
	for (var i=0; i<stripQueue.length; i++){
		var o = document.getElementById(stripQueue[i]);
		var newHTML = o.innerHTML;	
		//Strip the comments
		newHTML = newHTML.replace(/<!--\s/g, "");
		newHTML = newHTML.replace(/\s-->/g, "");
		//Neutralise the embed tag
		newHTML = newHTML.replace(/<embed/gi, "<span");		
		//Create a new div element with properties from the object
		var d = document.createElement("div");
		d.innerHTML = newHTML;
		d.className = o.className;
		d.id = o.id;
		//And swap the object with the new div
		o.parentNode.replaceChild(d, o);
	}
}

if (neoarchaic.objswap == undefined){
	neoarchaic.objswap = new neoarchaic.ObjectSwap();
}