/*--------------------------------------------------------------------------------\
|                                  IFRAME Support                                 |
|---------------------------------------------------------------------------------|
| Author:          Dan Sutton                                                     |
| Date:            October 3rd, 2008                                              |
| Version:         3.0.1                                                          |
| Contact:         dan@opwernby.com                                               |
\--------------------------------------------------------------------------------*/

var iframeSupport=
{
	items:		[],

	// Browser Determination
	browser:	navigator.userAgent.toLowerCase(),
	firefox:	(navigator.userAgent.toLowerCase().indexOf("firefox")>=0),
	ie:				(navigator.userAgent.toLowerCase().indexOf("msie")>=0),
	opera:		(navigator.userAgent.toLowerCase().indexOf("opera")>=0),
	netscape:	(navigator.userAgent.toLowerCase().indexOf("netscape")>=0),
	safari:		(navigator.userAgent.toLowerCase().indexOf("safari")>=0),

	// Add an IFRAME, with optional startup URL
	add: function(name,url)
	{
		var x=new iframeClass(name,(url? url : ""));
		document.write(x.toString());
		this.items[name]=x;
		return x;
	},

	// Get the given IFRAME's class
	get: function(name)
	{
		return this.items[name];
	},
				
	// Execute a page inside the given IFRAME
	execute: function(name, url)
	{
		var r=this.get(name);
		if (r)
		{
			url+=(url.indexOf("?")>=0? "&" : "?")+"if_rnd="+Math.random();
			r.execute(url);
		}
	},
										
	// Get the actual IFRAME with the given name
	getFrame: function(name)
	{
		var r=null;
		var f=this.get(name);
		if (f)
			r=f.getFrame();
		return r;
	},
						
	// Get the document.frames[name] object containing the actual IFRAME
	getFramesObject: function(name)
	{
		var r=null;
		var f=this.get(name);
		if (f)
			r=f.getFramesObject();
		return r;
	},
										
	// Find an IFRAME independently of this structure
	findFrame: function(name)
	{
		if (this.firefox || this.opera || this.safari)
		{
			var f=eval("window.frames."+name);
			if (!f)
				f=document.getElementById(name);
			return f;
		}
		else if (this.safari || this.firefox)
			return document.getElementById(name);
		else
			return document.frames[name];
	}
};

// Class for creating and using IFRAMEs
function iframeClass(name,url)
{
	this.name=name;
	this.url=url;
	this.divName="idiv__"+name;
}
	
// Get HTML to define the IFRAME
iframeClass.prototype.toString=function()
{
	var HTML="";
/*
	// For debugging only
	if (this.name.indexOf("sys_execute")>=0)
		HTML="<div id='"+this.divName+"'"
		 +" style='position:absolute; top:0; left:0;'>"
		 +"<iframe id='"+this.name+"' name='"+this.name+"'"
		 +(this.url? " src=\""+this.url.replace('"','\"')+"\"" : "")
		 +">"
		 +"</iframe></div>";
	else
*/
	// Live code
	HTML="<div id='"+this.divName+"'"
	 +" style='position:absolute; top:0; left:0; width:10;"
	 +" height:10; overflow:hidden; visibility:hidden'>"
	 +"<iframe id='"+this.name+"' name='"+this.name+"'"
	 +(this.url? " src=\""+this.url.replace('"','\"')+"\"" : "")
	 +" style='visibility:hidden; width:10; height:10;'>"
	 +"</iframe></div>";
	return HTML;
};

// Get the IFRAME element. Firefox has bugs in it which prevent this from working properly,
// so we have to have a special case...
iframeClass.prototype.getFrame=function()
{
	var f=null;
	if (iframeSupport.firefox || iframeSupport.opera)
		f=document.getElementById(this.name);
	else
	{
		var d=document.getElementById(this.divName);
		if (d)
			for (var i=0; (i<d.children.length) && (f==null); i++)
			{
				var x=d.children[i];
				if (x.tagName.toLowerCase()=='iframe')
					f=x;
			}
	}
	return f;
};

// Get the object that's actually sitting inside document.frames
// (object.frameObject == this.getFrame). If you want to execute
// functions, for example, which are within the frame, then you'll
// need to use the object to refer to them, e.g.:
//  frameSupport.getObject("test").doSomething();
iframeClass.prototype.getFramesObject=function()
{
	var f=null;
	if (iframeSupport.firefox || iframeSupport.opera)
		f=eval("window.frames."+this.name);
	else
		try
		{
			f=this.getFrame().document.frames[this.name];
		}
		catch(e)
		{
			f=document.getElementById(this.name);
		}
	return f;
};

// Execute a page inside the IFRAME
iframeClass.prototype.execute=function(url)
{
	var r=false;
	var f=this.getFrame();
	if (f!=null)
	{
		url+=(url.indexOf("?")>=0? "&" : "?")+"exec__rnd="+Math.random();
		f.src=url;
		r=true;
	}
	return r;
};

// This executes a URL inside an invisible IFrame. It appends a random number
// as a parameter to the URL in order to defeat the page caching that browsers
// such as Safari use, and which prevents such pages from being refreshed twice
// in a row.
iframeSupport.add("sys_execute");

function execute(url)
{
	iframeSupport.execute("sys_execute", url);
}