Save My Brain!

[herghost]

Im sure this is pretty simple but my brain is cooked! I have this code on the site www.jollyhosting.com which loads a menu, for the life of me I cannot center it

 

<div id="container">
  <div id="mainContent">
  <script type='text/javascript'>var MenuLinkedBy='AllWebMenus [4]',awmMenuName='menu',awmBN='DW';awmAltUrl='';</script>
<script charset='UTF-8' src='menu.js' type='text/javascript'></script>
<script type='text/javascript'>awmBuildMenu();</script>
    <h1>
      <script type="text/javascript" src="file:///C|/Web Stuff/My Sites/Jolly Hosting/New/menu.js"></script>
    </h1>
    <h1> </h1>
    <!-- end #mainContent -->
  </div>
  <!-- end #container -->
</div>

[phpQuestioner]

<div id="container" style="display:block;width:100%" align="center">
  <div id="mainContent">
  <script type='text/javascript'>var MenuLinkedBy='AllWebMenus [4]',awmMenuName='menu',awmBN='DW';awmAltUrl='';</script>
<script charset='UTF-8' src='menu.js' type='text/javascript'></script>
<script type='text/javascript'>awmBuildMenu();</script>
    <h1>
      <script type="text/javascript" src="file:///C|/Web Stuff/My Sites/Jolly Hosting/New/menu.js"></script>
    </h1>
    <h1> </h1>
    <!-- end #mainContent -->
  </div>
  <!-- end #container -->
</div>