/*************************************************************
*    DYNIFS - Dynamic IFrame Auto Size v1.0.0
*
*    Copyright (C) 2006, Markus (phpMiX)
*    This script is released under GPL License.
*    Feel free to use this script (or part of it) wherever you need
*    it ...but please, give credit to original author. Thank you. :-)
*    We will also appreciate any links you could give us.
*    http://www.phpmix.org
*
*    Enjoy! ;-)
*************************************************************/

var DYNIFS = {
	// Storage for known IFrames.
	iframes: {},
	// Here we save any previously installed onresize handler.
	oldresize: null,
	// Flag that tell us if we have already installed our onresize handler.
	ready: false,
	// The document dimensions last time onresize was executed.
	dim: [-1, -1],
	// Timer ID used to defer the actual resize action.
	timerID: 0,
	// Obtain the dimensions (width,height) of the given document.
	getDim: function(d)
	{
		try
		{
			var w = 200, h = 200, scr_h, off_h;
			if (d.height) { return [d.width, d.height]; }
			with (d.body)
			{
				if (scrollHeight) { h = scr_h = scrollHeight; w = scrollWidth; }
				if (offsetHeight) { h = off_h = offsetHeight; w = offsetWidth; }
				if (scr_h && off_h) h = Math.max(scr_h, off_h);
			}
		}
		catch (e)
		{
		}
		
		return [w, h];
	},
	// This is our window.onresize handler.
	onresize: function()
	{
		// Invoke any previously installed onresize handler.
		if (typeof this.oldresize == 'function') { this.oldresize(); }
		// Check if the document dimensions really changed.
		var dim = this.getDim(document);
		if (this.dim[0] == dim[0] && this.dim[1] == dim[1]) return;
		// Defer the resize action to prevent endless loop in quirksmode.
		if (this.timerID) return;
		this.timerID = setTimeout('DYNIFS.deferred_resize();', 10);
	},
	// This is where the actual IFrame resize is invoked.
	deferred_resize: function()
	{
		// Walk the list of known IFrames to see if they need to be resized.
		for (var id in this.iframes) this.resize(id);
		// Store resulting document dimensions.
		this.dim = this.getDim(document);
		// Clear the timer flag.
		this.timerID = 0;
	},
	// This is invoked when the IFrame is loaded or when the main window is resized.
	resize: function(id)
	{
		// Browser compatibility check.
		if (!window.frames || !window.frames[id] || !document.getElementById || !document.body)
			return;
		// Get references to the IFrame window and layer.
		var iframe = window.frames[id];
		var div = document.getElementById(id);
		if (!div) return;
		// Save the IFrame id for later use in our onresize handler.
		if (!this.iframes[id])
		{
			this.iframes[id] = true;
		}
		// Should we inject our onresize event handler?
		if (!this.ready)
		{
			this.ready = true;
			this.oldresize = window.onresize;
			window.onresize = new Function('DYNIFS.onresize();');
		}
		// This appears to be necessary in MSIE to compute the height
		// when the IFrame'd document is in quirksmode.
		// OTOH, it doesn't seem to break anything in standards mode, so...
		if (document.all) div.style.height = '0px';
		// Resize the IFrame container.
		var dim = this.getDim(iframe.document);
		div.style.height = (dim[1] + 30) + 'px';
	}
};