(function($){
	$.fn.extend({
		center: function (options) {
			var options =  $.extend({ // Default values
				inside:window, // element, center into window
				transition: 0, // millisecond, transition time
				minX:0, // pixel, minimum left element value
				minY:0, // pixel, minimum top element value
				withScrolling:true, // booleen, take care of the scrollbar (scrollTop)
				vertical:true, // booleen, center vertical
				horizontal:true // booleen, center horizontal
			}, options);
			return this.each(function() {
				var props = {position:'absolute'};
				if (options.vertical) {
					var top = ($(options.inside).height() - $(this).outerHeight()) / 2;
					if (options.withScrolling) top += $(options.inside).scrollTop() || 0;
					top = (top > options.minY ? top : options.minY);
					$.extend(props, {top: top+'px'});
				}
				if (options.horizontal) {
					var left = ($(options.inside).width() - $(this).outerWidth()) / 2;
					if (options.withScrolling) left += $(options.inside).scrollLeft() || 0;
					left = (left > options.minX ? left : options.minX);
					$.extend(props, {left: left+'px'});
				}
				if (options.transition > 0) $(this).animate(props, options.transition);
				else $(this).css(props);
				return $(this);
			});
		}
	});
})(jQuery);