if (document.getElementById('htmlPreview') != null)
{
    var output = 'You don\'t have any content for this module.'; 
    // Remove initial br
    var output = output.replace(/<br\/>/, '');
    // Replace all br entities with br tag
    document.getElementById('htmlPreview').innerHTML = output.replace(/&lt;br\/&gt;/g, '<br/>');
}


document.write('You don\'t have any content for this module.'); // done