Adding/Removing Items from header top links

To edit top links content, we need to access the xml files

1. app/design/frontend/default/default/layout/checkout.xml
2. app/design/frontend/default/default/layout/customer.xml

[code]

<!--
Default layout, loads most of the pages
-->

    <default>

        <!-- Mage_Customer -->
        <reference name="top.links">
            <action method="addLink" translate="label title" module="customer"><label>My Account</label><url helper="customer/getAccountUrl"/><title>My Account</title><prepare/><urlParams/><position>10</position></action>
<action method="addLink" translate="label title" module="customer"><label>Contact
Us</label><url>contacts</url><title>Contact
Us</title><prepare/><urlParams/><position>999</position></action>
</reference>
    </default>
[/code]