The headers don't line up with the column widths. [JsFiddle](http://jsfiddle.net/DyMSb/1/).

[Screenshot](http://s17.postimg.org/dybznay9b/screen.png)

I'm using:

* ajax.aspnetcdn.com/ajax/jquery.dataTables/1.9.0/css/jquery.dataTables.css
* ajax.aspnetcdn.com/ajax/jquery.dataTables/1.9.0/css/jquery.dataTables\_themeroller.css
* datatables.net/release-datatables/media/js/jquery.js
* datatables.net/release-datatables/media/js/jquery.dataTables.js
* datatables.net/release-datatables/extras/FixedColumns/media/js/FixedColumns.js

Here is the code I'm using:

JS:

```
$(document).ready(function() {   
    var aoColumns = [null,null,null,null,null,null,null,null,null,null,null];

    var oTable = $('#example').dataTable( {
        "sScrollX": "100%",
        "sScrollXInner": "150%",
        "bPaginate": false,
        "bAutoWidth": false,
        "aoColumns": aoColumns       
    } );

    var oFC = new FixedColumns( oTable, {
        "iLeftColumns": 4
    } );

    oTable.fnAdjustColumnSizing();
});

```

HTML:

```
<body>
   <div class="container">
      <table width="100%" cellpadding="0" cellspacing="0" border="1" id="example">
         <thead>
            <tr>
               <th rowspan="2">Branch</th>
               <th rowspan="2">Object</th>
               <th rowspan="2">Address</th>
               <th rowspan="2">Count</th>
               <th colspan="7">Availability</th>
            </tr>
            <tr>
               <th>15</th>
               <th>16</th>
               <th>17</th>
               <th>18</th>
               <th>19</th>
               <th>20</th>
               <th>21</th>
            </tr>
         </thead>
         <tbody>
            <tr>
               <td>United States of America, Washington</td>
               <td>ABC-123</td>
               <td>1514 Amber Pond Highway, Nohead Bottom, Washington, 99205-8224, US, (425) 023-9448</td>
               <td><a href="#">7</a></td>
               <td>-</td><td>-</td><td>-</td>
               <td>-</td><td>-</td><td>-</td><td>-</td>
            </tr>
            <tr>
               <td>United States of America, South Dakota</td>
               <td>DEF-456</td>
               <td>7827 Stony Pointe, Sunsweet, South Dakota, 57006-2156, US, (605) 621-7800</td>
               <td><a href="#">7</a></td>
               <td>-</td><td>-</td><td>-</td>
               <td>-</td><td>-</td><td>-</td><td>-</td>
            </tr>
            <tr>
               <td>United States of America, Newfoundland</td>
               <td>XYZ-549</td>
               <td>2379 Dewy Pioneer Highlands, Humbug, Newfoundland, A7O-6P5, CA, (709) 217-5115</td>
               <td><a href="#">7</a></td>
               <td>-</td><td>-</td><td>-</td>
               <td>-</td><td>-</td><td>-</td><td>-</td>
            </tr>
            <tr>
               <td>United States of America, Washington</td>
               <td>GHI-789</td>
               <td>5842 Easy Bay, Kravaksarak, Washington, 98428-9376, US, (425) 998-1922</td>
               <td><a href="#">7</a></td>
               <td>-</td><td>-</td><td>-</td>
               <td>-</td><td>-</td><td>-</td><td>-</td>
            </tr>
         </tbody>
      </table>
   </div>
</body>

```