//$('.blockOverlay, a.unblock').live('click',
// $.unblockUI();
//    return false;
//});
$('a.unblock').live('click', function(){
  $.unblockUI();
  return false;
});

function block_css(w, h) {
  var x = parseInt(w, 10);
  var o = { 
      left: ($(window).width() - x) /2 + 'px', 
      width: w
  };
  if (h) {
    var y = parseInt(h, 10);
    $.extend(o, {
      top:  ($(window).height() - y) /2 + 'px', 
      height: h      
    });
  }
  return o;
}