function arraysEqual(a1,a2) {
    return JSON.stringify(a1)==JSON.stringify(a2);
}

newJSON = <%= @mapjson %>;

if (!arraysEqual(json,newJSON)) {
  json = newJSON;
  $.each(json, function(i,topic){
          var temp = Mconsole.graph.getNode(topic.id);
          
          // in this case the node wasn't on the page before, so we create it
          if (temp == null) {
            Mconsole.graph.addNode(topic);
            var temp = Mconsole.graph.getNode(topic.id);
            temp.setData('dim', 1, 'start');
            temp.setData('dim', 25, 'end');
            var newPos = new $jit.Complex(); 
            newPos.x = temp.data.$xloc; 
            newPos.y = temp.data.$yloc; 
            temp.setPos(newPos, 'start');
            temp.setPos(newPos, 'current');
            temp.setPos(newPos, 'end');
            Mconsole.fx.plotNode(temp, Mconsole.canvas);
            Mconsole.labels.plotLabel(Mconsole.canvas, temp, Mconsole.config);
            Mconsole.fx.animate({  
              modes: ['node-property:dim','edge-property:lineWidth'],  
              duration: 1000    
            });
          }
          else { // in this case we found a topic so we have to update it
            temp.adjacencies = topic.adjacencies;
            var newPos = new $jit.Complex(); 
            newPos.x = temp.data.$xloc; 
            newPos.y = temp.data.$yloc; 
            temp.setPos(newPos, 'end');
            var label = Mconsole.labels.getLabel(topic.id);  
            if (temp.name != topic.name) {
              temp.name = topic.name;
              $(label).find('.best_in_place_name').html(topic.name);
              $(label).find('.label').html(topic.name);
            }
            if (temp.data.$metacode != topic.data.$metacode) {
              $(label).find('.best_in_place_metacode').html(topic.data.$metacode);
              $(label).find('img.icon').attr('alt', topic.data.$metacode);
              $(label).find('img.icon').attr('src', imgArray[topic.data.$metacode].src);
            }
            if (temp.data.$desc != topic.data.$desc) {
              $(label).find('.best_in_place_desc').html(topic.data.$desc);
            }
            if (temp.data.$link != topic.data.$link) {
              $(label).find('.best_in_place_link').html(topic.data.$link);
              $(label).find('.link').attr('href',topic.data.$link);
            }
            temp.data = topic.data;
          }
  });

  Mconsole.animate({
     modes: ['linear'],
     transition: $jit.Trans.Quad.easeInOut,
     duration: 500
  });
}