How can I refer to a nested div by id when it has the same id as a div nested in a similarly named div

eg

<div id=obj1>

    <div id=Meta>

        <meta></meta>

    </div>

</div>



<div id=obj2>

    <div id=Meta>

        <meta></meta>

    </div>

</div>

I want to get the innerHTML of meta

document.getElementById('obj1').getElementById('Meta').getElementsByTagName('meta')

doesn't work