Hi

In a new module put your file somewhere under static (i.e, newmodule/static/src/js or newmodule/static/lib) and put your javascript code there

Then you need a view to load your javascript code like that

<openerp>
  <data>
    <!-- Templates -->
    <template id="assets_frontend" name="newmodule_asset_frontend" inherit_id="website.theme">
      <xpath expr="." position="inside">
        <!-- Custom JS and CSS --> 
        <script type="text/javascript" src="/newmodule/static/src/js/jquerryaddons.js" />
      </xpath>
    </template>
  </data>
</openerp>
After that you gonna be able to use it by adding code to your page