// JavaScript Document
$(window).resize(function() {	
	if 	($(window).width()<$('#container').width())	
	{
		derecha=0;
	}else
	{
		derecha=($(window).width() - $('#container').outerWidth())/2;
	};

	if 	($(window).height()<$('#container').height())	
	{
		arriba=0;
	}else
	{
		arriba=($(window).height() - $('#container').outerHeight())/2;
	}
	$('#container').css({
		   position:'absolute',
		   left: derecha,
		   top: arriba
	  });	

});