Skip null grid to avoid rounding errors : we know consider the null grid as identity grid !

                continue;

            }

            /* If we have child nodes, check to see if any of them apply. */

            /* TODO : only plain grid has implemented ... */

            /* TODO : only plain grid has been implemented ... */

            /* we found a more refined child node to use */

            /* load the grid shift info if we don't have it. */

            /* TODO : Proj4js.grids pre-loaded (as they can be huge ...) */

            /* skip numerical computing error when "null" grid (identity grid): */

            if (gi.name=="null") {

                output.x= input.x;

                output.y= input.y;

            } else {

                output= Proj4js.common.nad_cvt(input, inverse, ct);

            }

            if (!isNaN(output.x)) {

                break;

            }

      }

      if (this.nadgrids) {

        this.grids= this.nadgrids.split(",");

        var g= null;

        for (var i= 0, l= this.grids.length; i<l; i++) {

        var g= null, l= this.grids.length;

        if (l>0) {

          for (var i= 0; i<l; i++) {

            g= this.grids[i];

            var fg= g.split("@");

            if (fg[fg.length-1]=="") {

              Proj4js.reportError("nadgrids syntax error '"+this.nadgrids+"' : empty grid found");

              continue;

            }

            this.grids[i]= {

              mandatory: fg.length==1,//@=> optional grid (no error if not found)

              name:fg[fg.length-1],

              Proj4js.reportError("Missing '"+this.grids[i].name+"'");

            }

          }

        }

        // DGR, 2011-03-20: grids is an array of objects that hold

        // the loaded grids, its name and the mandatory informations of it.

      }