code: function(layerPx) {
          var viewPortPx = null;
          if (layerPx != null) {
              var dX = this.layerContainerOriginPx.x;
              var dY = this.layerContainerOriginPx.y;
              viewPortPx = layerPx.add(dX, dY);            
          }
          return viewPortPx;
      }
docs: TRANSLATION: ViewPortPx <-> LayerPx  
  APIMethod: getViewPortPxFromLayerPx
  
  Parameters:
  layerPx - {<OpenLayers.Pixel>}
  
  Returns:
  {<OpenLayers.Pixel>} Layer Pixel translated into ViewPort Pixel
  coordinates