DIV如何双击关闭

<DIV id=ph style="Z-INDEX: 1; LEFT: 241px; VISIBILITY: visible; WIDTH: 139px; CURSOR: hand; POSITION: absolute; TOP: 132px; HEIGHT: 19px;"><SCRIPT>function st(){document.getElementById("sss").style.display="none"}</SCRIPT><div id="sss" ondblclick="javascript:st();" >双击我</DIV>

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