$(document).ready(function(){
   var thisHeight = Math.max(0,parseInt(($(window).height()-$("#content").height())/2));
   thisHeight = thisHeight-10;
   $("#content").css("margin-top",thisHeight+"px");
   $(window).resize(function() {
  		var thisHeight = Math.max(0,parseInt(($(window).height()-$("#content").height())/2));
  		thisHeight=thisHeight-10;
  		$("#content").css("margin-top",thisHeight+"px");
	});
});