Set innerHTML of Span in Modal

I'm trying to open a modal and then set the innerHTML of a span, but can't seem to get it working.

The modal is

            //'header'=>'<h4>Add a New Company</h4>',
            //'headerOptions' => ['id' => 'modalHeader'],
            'header' => '<span id="modalHeaderTitle"></span>',
            'headerOptions' => ['id' => 'modalHeader'],
            'closeButton' => [
                'class'=>'btn btn-warning pull-right',
            'clientOptions' => [
                'backdrop' => 'static', //true,
                'keyboard' => false, // true,
        echo '  <div id="modal-system-messages" style="opacity: 1; display: none"></div>';
        echo "<div id='modalContent'></div>";

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And then my js for the calling button is

        function (){
            //Open the modal window
			// Set the modal title span
			// alert($(this).attr('title'));
			$('#modalPopup #modalHeader #modalHeaderTitle').innerhtml = '<h4>' + $(this).attr('title') + '</h4>';

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I have validated that alert($(this).attr('title')); is returning the proper value but the .innerHTML line does nothing.

Thank you for your help.
LVL 15
Daniel PineaultPresident / Owner CARDA Consultants Inc.Asked:
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references :

$('#modalPopup #modalHeader #modalHeaderTitle').html('<h4>' + $(this).attr('title') + '</h4>');

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Daniel PineaultPresident / Owner CARDA Consultants Inc.Author Commented:
Thank you.  I was sure I had already tried that, but apparently not.  Thank you for the links.  I will take some time tomorrow to look them over and try to get up to speed properly.  Thank you once again, your help was greatly appreciated!
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