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    Ah yes...

    /app/design/frontend/default/hellomix/layout/page.xml

    Just under:
    <block type="page/html_head" name="head" as="head">

    Add:
    <action method="addJs"><script>lib/ccard.js</script></action>

    Save the file and check that the file is being loaded by viewing the source code of your site. If it's not being loaded you need to visit the cache management area and start clearing/refreshing.

    Once that file loads, try checking out again in your store.