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  <div id="b" class="divb"></div>
  <div id="c" class="divc"></div>
  ........

  </div>

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<div id="b" class="divb"></div>
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this.class='myclass';

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<div id="a" class="diva" onmousemove="this.className='diva2';"></div>

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div id="a" class="diva" onmouseover="changeclass()";>
  <div id="b" class="divb"></div>
  <div id="c" class="divc"></div>
  ........

  </div>

<script language="javascript">
function changeclass()
{
  getELementById('a').className='MyClassName';
}
</script>

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div id="a" class="diva" onmouseover="changeclass()";>
<div id="b" class="divb"></div&g