creating instances

I want to create my own classes and instantiate like normal OOP code.

I tried using

 line = ScriptableObject.CreateInstance(PathMaker);

93[ScriptableObject.CreateInstance() ][1]93 but this gave:

 Instance of PathMaker couldn't be created.
 The the script class needs to derive from ScriptableObject.

how should i do that from javascript?

my class looks something like the below. its just to draw lines on screen, but i need a lot of instances of these paths with their own points.

 // Creates a line renderer for path of objects
 
 var c1 : Color = Color.yellow;
 var c2 : Color = Color.red;
 var path: Array;
 var lineRenderer: LineRenderer;
 
 function Start() {
      lineRenderer = gameObject.AddComponent(LineRenderer);
      lineRenderer.material = new Material (Shader.Find("Particles/Additive"));
      lineRenderer.SetColors(c1, c2);
      lineRenderer.SetWidth(0.2,0.2);
      
      var points = [Vector3( 0,0,0),         
          Vector3(0,50,0)
      ];
      setPath(points);
      addPoint(Vector3(0,10,0));
 }
 
 public function setPath(pointList: Array) {
     path = pointList;
     setPointCount();
 }
 
 public function addPoint(pt: Vector3) {
     path.Push(pt);
     setPointCount();
 }
 
 function setPointCount() {
     lineRenderer.SetVertexCount(path.length);
 }
 
 function Update() {
     var lineRenderer : LineRenderer = GetComponent(LineRenderer);
     for(var i : int = 0; i < path.length; i++) {
         var pos: Vector3 = path[i];
         lineRenderer.SetPosition(i, pos);
     }
 }