running a notebook with a batch file

Question

I am using Windows (7 if needed). I am trying to learn how to write a batch file that EXECUTES a notebook.

This is the batch

@echo off
START "C:\Programmi\Wolfram Research\Mathematica\8.0\MathKernel.exe" test.nb

it opens mathematica, but doesn't executes the notebook. So I tried (in the notebook) to select the cell and:

Cell>Cell properties>Initialization

but still it only opens the notebook.

What am I missing?

The notebook:

Export["C:\\Users\\MATTIA\\Desktop\\FIT\\Fam_II\\test.jpg", 
 Plot[Sin[x], {x, 0, 10}]]

just plots and saves a sin function