[css] Centering a button vertically in table cell, using Twitter Bootstrap

I'm using Twitter Bootstrap, and attempting to center a button within a table cell. I only really need it centered vertically.

<table class="table table-bordered table-condensed">
  <tbody>
    <tr>
      <td><a href="#" class="btn btn-primary"><i class="icon-check icon-white"></i></a></td>
      <td><a href="#">Todo Item One</a><br /><span class="label label-success">One thing</span></td>
    </tr>
  </tbody>
</table>

Please see my JSFiddle for the problem. I've tried several table centering tricks I know about, but none seem to work properly. Any ideas? Thanks in advance.

UPDATE: Yes, I've tried vertical-align:middle;, and that works if it's inline, but not if it's in a class the td has. Updated the JSFiddle to reflect this.

Final Update: I'm an idiot, and didn't check to see if it was being overwritten by bootstrap.css

A little update for Bootstrap 3.

Bootstrap now has the following style for table cells:

.table tbody>tr>td
{
    vertical-align: top;
}

The way to go is to add a your own class, with the same selector:

.table tbody>tr>td.vert-align
{
    vertical-align: middle;
}

And then add it to your tds

<td class="vert-align"></td>

add this to your css

.table-vcenter td {
   vertical-align: middle!important;
}

then add to the class to your table:

        <table class="table table-hover table-striped table-vcenter">

Add vertical-align: middle; to the td element that contains the button

<td style="vertical-align:middle;">  <--add this to center vertically
  <a href="#" class="btn btn-primary">
    <i class="icon-check icon-white"></i>
  </a>
</td>

So why is td default set to vertical-align: top;? I really don't know that yet. I would not dare to touch it. Instead add this to your stylesheet. It alters the buttons in the tables.

table .btn{
  vertical-align: top;
}

To fix this, i put this class on the webpage

<style>                        
    td.vcenter {
        vertical-align: middle !important;
        text-align: center !important;
    }
</style>

and this in my TemplateField

<asp:TemplateField ItemStyle-CssClass="vcenter">

as the CSS class points directly to the td (tabledata) element and has the !important statment at the end each setting. It will over rule bootsraps CSS class settings.

Hope it helps