Find a shader not in the scene

Hi there,

I was wondering if someone could direct me as to go about finding the inbuilt shaders within my script without having them attached to a material in my scene. I keep getting null pointer exceptions when i start my scene. Here is part of my code:

     private var render:Renderer;
 private var shaders:Shader[];
 
 
 function Start () {
     render = this.gameObject.renderer;
     shaders[0] = Shader.Find("Transparent/Bumped Diffuse");
     shaders[1] = Shader.Find("Transparent/Bumped Specular");
     shaders[2] = Shader.Find("Transparent/VertexLit");
     shaders[3] = Shader.Find("HeatDistort");
     shaders[4] = Shader.Find("FX/Flare");
     shaders[5] = Shader.Find("Particles/Additive");
     shaders[6] = Shader.Find("Particles/Soft");
     shaders[7] = Shader.Find("Particles/Multiply");
     shaders[8] = Shader.Find("Particles/Multiply (Double)");
 }

Thanks in advance