控制层的显示

<script language="JavaScript">
function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d
)&&d.all) x=d.all
; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i]
;
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_showHideLayers() { //v6.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v=='hide')?'hidden':v; }
    obj.visibility=v; }
}
</script>

<div id="Layer1" style="position:absolute">
<div id="Layer2" style="position:absolute; left:141px; top:328px; width:141px; height:36px; z-index:2;visibility: hidden; ">
    <table width="500" border="0" align="center" cellpadding="0" cellspacing="1" bgcolor="#FF6600" style="margin-bottom: 0px">
      <tr>
        <td height="18" align="center" valign="middle"bgcolor="#FFFEF7">内容</td>
      </tr>
    </table>
  </div>
</div>

<input name="Submit1" type="button" onClick="MM_showHideLayers('Layer2','','show')" onDblClick="MM_showHideLayers('Layer2','','hide')" value="">