radio button error placement

radio button error placement

I have a table with my rows in it and a row contains 3 td's with radio button's in them (im open for a redesign idea).
 
When i validate i get 'big' red boxes around each radio button and the text goes below and 'This field is required' appearing after the first radio button. ( bec i havnt got any validation on the page for it)
 
How do i create validation just for these and put some error msg somewhere appropriate?

    <tr rowheight=40 valign=bottom class="normal">
     <td class="normal"><input type="radio" name="rehabLevel" value="A" class="required">&nbsp; Hub - Category A</td>
     <td class="normal"><input type="radio" name="rehabLevel" value="B">&nbsp; Spoke - Category B</td>
     <td class="normal"><input type="radio" name="rehabLevel" value="I">&nbsp; Spoke - Individual Case Consideration</td>
    </tr>