anchor.diff:                      left: this.x * 100 + '%',
                       top: this.y * 100 + '%'
                   });
  -                if (this.name === 'America/Toronto') {
  +                if (this.name === $field.val())
                       changeCenter(this);
  -                }
               }
   
               Center.prototype = {
  
positive.code:                 }
              });
  
              $('.map-inset').mousemove(function (e) {
                  var offset = $(this).offset(),
                      x = e.pageX - offset.left,
                      y = e.pageY - offset.top,
  
negative.code:             var $map = $('.map-inset'),
                  $axisX = $('.map-axis-x'),
                  $axisY = $('.map-axis-y'),
                  $field = $('#id_timezone'),
                  width = $map.outerWidth(),
                  height = $map.outerHeight(),
                  lastCenter,
  