/***************************************************************
*  Copyright notice
*
*  (c) 2008-2009 Jeff Segars <jeff@webempoweredchurch.org>
*  All rights reserved
*
*  This script is part of the TYPO3 project. The TYPO3 project is
*  free software; you can redistribute it and/or modify
*  it under the terms of the GNU General Public License as published by
*  the Free Software Foundation; either version 2 of the License, or
*  (at your option) any later version.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*  A copy is found in the textfile GPL.txt and important notices to the license
*  from the author is found in LICENSE.txt distributed with these scripts.
*
*
*  This script 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 General Public License for more details.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/


Element.addMethods({
	pngHack: function(element) {
		element = $(element);
		var transparentGifPath = 'clear.gif';

			// If there is valid element, it is an image and the image file ends with png:
		if (Object.isElement(element) && element.tagName == 'IMG' && element.src.endsWith('.png')) {
			var alphaImgSrc = element.src;
			var sizingMethod = 'scale';
			element.src = transparentGifPath;
		}

		if (alphaImgSrc) {
			element.style.filter = 'progid:DXImageTransform.Microsoft.AlphaImageLoader(src="#{alphaImgSrc}",sizingMethod="#{sizingMethod}")'.interpolate(
			{
				alphaImgSrc: alphaImgSrc,
				sizingMethod: sizingMethod
			});
		}

		return element;
	}
});

var IECompatibility = Class.create({

	/**
	 * initializes the compatibility class
	 */
	initialize: function() {
		Event.observe(document, 'dom:loaded', function() {
			$$('input[type="checkbox"]').invoke('addClassName', 'checkbox');
		}.bind(this));

		Event.observe(window, 'load', function() {
			if (Prototype.Browser.IE) {
				var version = parseFloat(navigator.appVersion.split(';')[1].strip().split(' ')[1]);
				if (version == 6) {
					$$('img').each(function(img){
						img.pngHack();
					});
				}
			}
		});
	}
});

if(Prototype.Browser.IE) {
	var TYPO3IECompatibilty = new IECompatibility();
}