I can easily tell you how to modify your mark up, but I see that you used the Drupal CMS, so I think that it would be better if you followed Drupal's instructions for modifying its templates.
I cannot advise you how to that because I don't use Drupal - when I need an off-the-shelf CMS, I gravitate towards Joomla for no other reason than a preference for open source. Drupal is its equal.
For the same reason, I cannot know for sure whether manually modifying the mark up would cause issues with Drupal's behaviour. Check the documentation first, then come back if you need to know the DIY option.