Two groups of checkboxes, if first one is checked second can not be

I have to "groups" of checkboxes(although the first group only contains one checkbox), but if user checks the checkbox from the first group I want to restrict the ability of checking the checkboxes from second group...

<div>
  <h3>First group</h3>
  <label>
    <input type="checkbox" value="1" name="group1" />If checked, checks all the checkboxes in 2nd group</label>
  <label>
</div>
<div>
  <h3>Second Group</h3>
  <label>
    <input type="checkbox" class="radio" value="1" name="group2" />1</label>
  <label>
    <input type="checkbox" class="radio" value="1" name="group2" />1</label>
</div>