(function($) {

	/**
	 * helper variables and function
	 */
	$.ifixpng = function(custompixel) {
		$.ifixpng.pixel = custompixel;
	};
	
	$.ifixpng.getpixel = function() {
		return $.ifixpng.pixel || 'ressources/blank.gif';
	};
	
	var hack = {
		ltie7  : $.browser.msie && $.browser.version < 7,
		filter : function(src) {
			return "progid:dximagetransform.microsoft.alphaimageloader(enabled=true,sizingmethod=crop,src='"+src+"')";
		}
	};
	
	
	 
	$.fn.ifixpng = hack.ltie7 ? function() {
    	return this.each(function() {
			var $$ = $(this);
			var base = $('base').attr('href'); // need to use this in case you are using rewriting urls
			if ($$.is('img') || $$.is('input')) { // hack image tags present in dom
				if ($$.attr('src')) {
					if ($$.attr('src').match(/.*\.png([?].*)?$/i)) { // make sure it is png image
						// use source tag value if set 
						var source = (base && $$.attr('src').substring(0,1)!='/') ? base + $$.attr('src') : $$.attr('src');
						// apply filter
						$$.css({filter:hack.filter(source), width:$$.width(), height:$$.height()})
						  .attr({src:$.ifixpng.getpixel()})
						  .positionfix();
					}
				}
			} else { // hack png css properties present inside css
				var image = $$.css('backgroundimage');
				if (image.match(/^url\(["']?(.*\.png([?].*)?)["']?\)$/i)) {
					image = regexp.$1;
					$$.css({backgroundimage:'none', filter:hack.filter(image)})
					  .children().children().positionfix();
				}
			}
		});
	} : function() { return this; };
	

	 
	$.fn.iunfixpng = hack.ltie7 ? function() {
    	return this.each(function() {
			var $$ = $(this);
			var src = $$.css('filter');
			if (src.match(/src=["']?(.*\.png([?].*)?)["']?/i)) { // get img source from filter
				src = regexp.$1;
				if ($$.is('img') || $$.is('input')) {
					$$.attr({src:src}).css({filter:''});
				} else {
					$$.css({filter:'', background:'url('+src+')'});
				}
			}
		});
	} : function() { return this; };
	
	/**
	 * positions selected item relatively
	 */
	 
	$.fn.positionfix = function() {
		return this.each(function() {
			var $$ = $(this);
			var position = $$.css('position');
			if (position != 'absolute' && position != 'relative') {
				$$.css({position:'relative'});
			}
		});
	};

})(jquery);