Hey i am Using Odoo v8 which is still using openerp. i want to modify default pie chart so i must inherit it, so how to do that ??   

=============== I put this into view module ================

<openerp>

    <data>

        <template id="assets_backend" name="custom_web_graph assets" inherit_id="web.assets_backend">

            <xpath expr="." position="inside">

                <script type="text/javascript" src="/custom/static/src/js/custom_nv_d3.js"></script>

            </xpath>

        </template>

    </data>

</openerp>

==================== THEN THE JS ==================
                                                HOW ?