[jQuery] A selector question

[Dragon-Fly999]

Hi, I have the following html and would like to find out how to select
#subgroup under #group2.  I tried $(#group2 #subgroup) but that didn't
seem to work.  Thank you.

<div id="main">
  <div id="group1">
    <div id="subgroup">
    ...
    </div>
  </div>

  <div id="group2">
    <div id="subgroup">
    ...
    </div>
  </div>

  <div id="group3">
    <div id="subgroup">
    ...
    </div>
  </div>
</div>