求救！！应该怎样调用这个函数？？？

Question

onClick="parent.Layer1.style.visibility="visible";// hidden为隐藏

Answer 1

onClick="parent.Layer1.style.visibility='visible';" // hidden为隐藏

Answer 2

demo.htm <script language="javascript">

browser = navigator.appName;
browserNum = parseInt(navigator.appVersion);

if ((browser == "Netscape") && (browserNum < 5))
{
// Netscape 4.x
layerRef = "document.layers['";
endLayerRef = "']";
styleRef = "";
}
else if ((browser == "Netscape") && (browserNum >= 5))
{
// Netscape 6
layerRef = "document.getElementById('";
styleRef = ".style";
endLayerRef = "')";
}
else
{
// Internet Explorer
layerRef = "document.all['";
endLayerRef = "']";
styleRef = ".style";
}

// create way to remember which layer is visible
oldLayer = "none";

function showMenu(layerName)
{
// show the layer the user wants to see
eval(layerRef + layerName + endLayerRef + styleRef + ".visibility = 'visible'");

// hide other window
if (oldLayer != "none")
{
eval(layerRef + oldLayer + endLayerRef + styleRef + ".visibility = 'hidden'");
}

if (oldLayer == layerName)
{
oldLayer = layerName;
}
else
{
oldLayer = layerName;
}

}
</script>
<div id="bao" style="visibility:hidden">dddd</div>
<iframe src="in.htm"></iframe>in.htm<input type=button onclick="top.showMenu('bao')">