求用JS实现隐式菜单的代码

<div style="background-color:#999999;width:100px;text-align:center;
padding:3px;border-bottom:1px solid #FFFFFF;z-index:1;"
onmouseover="myMenu.style.display='block'"
onmouseout="myMenu.style.display='none'">
  <div style="position:absolute;width:0px;height:0px;overflow:visible;"> 
    <div id=myMenu style="position:absolute;left:-10px;top:25px;display:none;
    width:90px;background-color:#CCCCCC;padding:5px;text-align:left;"> 
<font color="#FFFFFF">&nbsp;<a href="../fair_app/customer_b.php">1</a><br>
      <br>
      &nbsp;<a href="../fair_app/quotation_b.php">2</a><br>
      <br>
      &nbsp;<a href="../fair_app/fair_app_b.php">3</a><br>
      <br>
      &nbsp;<a>...</a><br>
      <br>
      </font></div>
  </div>
  <font color="#FFFFFF"><a href=#none><font size="4">check</font></a></font></div>