关于检测 组件 是否已安装？

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<HEAD>
<STYLE>
@media all {
      IE\:clientCaps {behavior:url(#default#clientcaps)}
}
</STYLE>
</HEAD><BODY>
<IE:clientCaps ID="oClientCaps" /><SCRIPT>
    sMSvmVersion = oClientCaps.getComponentVersion("{08B0E5C0-4FCB-11CF-AAA5-00401C608500}",
    "ComponentID"); 
</SCRIPT>    :
</BODY>