Create origin lines in ThreeJS

gistfile1.js

      function v(x, y, z) {
        return new THREE.Vertex(new THREE.Vector3(x, y, z));
      }

      var lineGeo = new THREE.Geometry();
      lineGeo.vertices.push(
          v(-50, 0, 0), v(50, 0, 0),
          v(0, -50, 0), v(0, 50, 0),
          v(0, 0, -50), v(0, 0, 50)
      );
      var lineMat = new THREE.LineBasicMaterial({
        color: 0x000000, lineWidth: 1});
      var line = new THREE.Line(lineGeo, lineMat);
      line.type = THREE.Lines;
      scene.add(line);
    }