怎么判断控件是否安装了呢
<OBJECT
classid = "clsid:8AD9C840-044E-11D1-B3E9-00805F499D93 "
codebase = "http://210.222.48.75/jvm_setup.exe "
WIDTH = "1024 " HEIGHT = "768 " >
<PARAM NAME = CODE VALUE = "testauto.Applet1.class " >
<PARAM NAME = CODEBASE VALUE = ". " >
<PARAM NAME = "type " VALUE = "application/x-java-applet;version=1.4 ">
<PARAM NAME = "scriptable " VALUE = "false ">
<PARAM NAME = "projectId " VALUE= " <%=theForm.getProjectId().toString()%> " >
<PARAM NAME = "userId " VALUE= " <%=userId%> " >
<PARAM NAME = "logLevel " VALUE= "INFO " >
<COMMENT>
<EMBED
type= "application/x-java-applet;jpi-version=1.4.1 "
CODE= "testauto.Applet1.class "
CODEBASE= ". "
WIDTH= "1024 "
HEIGHT= "768 "
projectId= " <%=theForm.getProjectId().toString()%> "
userId= " <%=userId%> "
logLevel= "INFO "
scriptable=false
pluginspage= "http://java.sun.com/j2se/1.4.1/download.html ">
<NOEMBED>
Could not find a plugin supported by your browser. Please download Sun 's Java Plugin 1.4.1
</noembed>
</EMBED>
</COMMENT>
</OBJECT>
这个是判断是否安装了jvm的，是吧？
由于这个JVM比较大，所以下载的时间就比较长，所以我想在他下载的时候给个提示，叫他等待，如果安装了JVM的就不会下载了的，这个提示呢也不会显示
所以怎么判断这个提示什么时候显示，什么时候不显示啊，代码怎么写啊，我是不懂网页的，我只是做applet，如果别人机器上没有JVM，就给他下载安装
[解决办法]
<applet width=712 height=482>
<PARAM NAME = 。。。。
<PARAM NAME = 。。。。
<PARAM NAME = 。。。。
<span class= "cDGray "> 如果您无法看到,请点此下载插件并安装,然后刷新此页面即可! </span>
</applet>
