position center

gistfile1.txt

(function($){
		$.fn.extend ({
			center:function() {
				return this.each(function(){
					var top = ($(window).height() - $(this).outerHeight())/2;
					var left = ($(window).width() - $(this).outerWidth())/2;
					$(this).css({position:'absolute',margin:0,top:(top>0 ? top:0)+'px',left:(left>0 ? left:0)+'px'});
				});
			}
		});
	})(jQuery);

	$('.center').center();
	$(window).resize(function(){
		$('.center').center();
	});