IE throws errors for $(this) in nested each loops

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Consider the following XML:

<dashboard>
    <locations>
        <location>
            <infowindowtab>
                <tab title="Location">
                    <![CDATA[ ... ]]>
		</tab>
                <tab title="Users">
                    <![CDATA[ ... ]]>
		</tab>
            </infowindowtab>
        </location>
    </locations>
</dashboard>

And that JavaScript (both simplified):

$.get(..., function(xml) {
    $('location', xml).each(function() {
        var content = [];
        var infoWindowTabs = $('infowindowtab', this);
            $('tab', infoWindowTabs[0]).each(function(k) {
            // workaround for IE needed here, $(this).text() throws an error
            content[k] = this.firstChild.data || $(this).text());
        });
    });
});

In that case IE fails on $(this).text() and throws an error (object does not support that property or method).