Be sure to use UNIQUE labels for every form field.
<label for="name">Name:</label><br /><input id="name" size="35" />
Favorite foods:
<input name="foods" id="choice1" type="radio"><label for="choice1">Indian</label>
<input name="foods" id="choice2" type="radio"><label for="choice2">Mexican</label>
<input name="foods" id="choice3" type="radio"><label for="choice3">Chinese</label>
In the example above, use something like <label for="your-name"> and <input id="your-name"> for the first fieldset, and <label for="spouse-name"> and <input id="spouse-name"> to distinguish the fields.