(function($){

$.fn.extend({

	/**
	 * Stores the original version of offset(), so that we don't lose it
	 */
	_offset : $.fn.offset,

	/**
	 * Set or get the specific left and top position of the matched
	 * elements, relative the the browser window by calling setXY
	 * @param {Object} newOffset
	 */
	offset : function(newOffset){
	    return !newOffset ? this._offset() : this.each(function(){
			var el = this;

			var hide = false;

			if($(el).css('display')=='none'){
				hide = true;
				$(el).show();
			};

			var style_pos = $(el).css('position');

			// default to relative
			if (style_pos == 'static') {
				$(el).css('position','relative');
				style_pos = 'relative';
			};

			var offset = $(el).offset();

			if (offset){
				var delta = {
					left : parseInt($(el).css('left'), 10),
					top: parseInt($(el).css('top'), 10)
				};

				// in case of 'auto'
				if (isNaN(delta.left))
					delta.left = (style_pos == 'relative') ? 0 : el.offsetLeft;
				if (isNaN(delta.top))
					delta.top = (style_pos == 'relative') ? 0 : el.offsetTop;

				if (newOffset.left || newOffset.left===0)
					$(el).css('left',newOffset.left - offset.left + delta.left + 'px');

				if (newOffset.top || newOffset.top===0)
					$(el).css('top',newOffset.top - offset.top + delta.top + 'px');
			};
			if(hide) $(el).hide();
		});
	}

});

})(jQuery);