code: function(force) { 
          if (force) {
              return this.mergeNewParams({"_olSalt": Math.random()});
          } else {
              return OpenLayers.Layer.prototype.redraw.apply(this, []);
          }
      }
docs: APIMethod: redraw
  Redraws the layer.  Returns true if the layer was redrawn, false if not.
  
  Parameters:
  force - {Boolean} Force redraw by adding random parameter.
  
  Returns:
  {Boolean} The layer was redrawn.