Randomize content help

am developing a web page and I have the following setup:


<div class="employee_container">
      <div id="group1"></div>
      <div id="group2"></div>
      <div id="group3"></div>
</div>

each time my page is refreshed I want to radnomize groups 1 thru 3. Maybe radomize isn’t the correct method but something like randomize. If you land on the page and group1 is present and then you refresh the page can you force group2 to the surface or force group3? I know with randomize you can refresh the page and group1 might appear all 3 times. I really am looking for something that will rotate the groups.