Macintosh support for Java applets

Is there a way to auto-install the Java Runtime and plugin for Mac browsers like Internet Explorer and Netscape?
Do the <object classid...> tags work on Macs too?
I do know that Mac OS X shipped with Java 1.3.1. But how can I find out if the plugin is supported by a Mac user's browser?
thank you very much.

Has anyone gotten applets with on OS X?!?!? I have an applet that is in signed JARs on my web server. Once they get cached, I get the following in the Java Console:
Trace level set to 5: basic, net, security, ext, liveconnect ... completed.
baseURL is https://myserver:11443/iBiomaticsPortal/ppv/
documentURL is https://myserver:11443/iBiomaticsPortal/ppv/yo.jsp
Referencing classloader: sun.plugin.ClassLoaderInfo@49d886, refcount=1
Added trace listener: com.apple.mrj.JavaEmbedding.JE_AppletViewerPanel[com.ibiomatics.ppv.applet.Applet,0,0,0x0,invalid,layout=java.awt.BorderLayout]
Sending events to applet. LOAD
Determine if the applet requests to install any JAR
Jar cache option: Plugin
Jar archive(s): DEapplet.jar,DEserverstubs.jar,jcchart451Kplus.jar
Jar cache version(s): 1.0.3.0,1.0.3.0,3.0.0.1
Check if DEapplet.jar exists as entry in cache table
Check if DEapplet.jar actually exists in cache
Check if DEapplet.jar is upto-date
DEapplet.jar is upto-date in cache
Check if DEserverstubs.jar exists as entry in cache table
Check if DEserverstubs.jar actually exists in cache
Check if DEserverstubs.jar is upto-date
DEserverstubs.jar is upto-date in cache
Check if jcchart451Kplus.jar exists as entry in cache table
Check if jcchart451Kplus.jar actually exists in cache
Check if jcchart451Kplus.jar is upto-date
jcchart451Kplus.jar is upto-date in cache
Sending events to applet. INIT
Applet Installation finished.
Sending events to applet. START
java.lang.ClassFormatError: com/ibiomatics/ppv/applet/Applet (Bad magic number)
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:488)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:106)
     at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:138)
     at sun.plugin.security.PluginClassLoader.access$201(PluginClassLoader.java:47)
     at sun.plugin.security.PluginClassLoader$1.run(PluginClassLoader.java:284)
     at java.security.AccessController.doPrivileged(Native Method)
     at sun.plugin.security.PluginClassLoader.findClass(PluginClassLoader.java:272)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:294)
     at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:107)
     at java.lang.ClassLoader.loadClass(ClassLoader.java:250)
     at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:463)
     at sun.applet.AppletPanel.createApplet(AppletPanel.java:581)
     at sun.plugin.AppletViewer.createApplet(AppletViewer.java:1334)
     at sun.applet.AppletPanel.runLoader(AppletPanel.java:510)
     at sun.applet.AppletPanel.run(AppletPanel.java:288)
     at java.lang.Thread.run(Thread.java:491)
If I look at the actual contents of the JAR file(s) in the cache, they are not JARs at all. They are HTML (text) files that look like this:
<html><head><title>302 Moved Temporarily</title></head>
<body bgcolor="#FFFFFF">
<p>This document you requested has moved temporarily.</p>
<p>It's now at /iBiomaticsSecurity/Login.jsp;jsessionid=211MQ0XryekiU1PrEyFAjBt8oe47JOlNJJnf7lvpgFMrXLPCl8Uw!-713944120!-1069893353!11800!11443.</p>
</body></html>
I have tried just about everything. My client is OS 10.2 running IE 5.2. I get the same results in Mozilla and Safari.
Here is the the HTML that contains my applet tag:
<HTML>
<HEAD>
<TITLE>P21 (TM) Data Explorer</TITLE>
</HEAD>
<BODY>
<APPLET WIDTH=100% HEIGHT=100% CODEBASE="https://myserver:11443/iBiomaticsPortal/ppv" CODE="com.ibiomatics.ppv.applet.Applet">
<PARAM NAME="CACHE_OPTION" VALUE="Plugin"/>
<PARAM NAME="CACHE_ARCHIVE" VALUE="DEapplet.jar,DEserverstubs.jar,jcchart451Kplus.jar"/>
<PARAM NAME="CACHE_VERSION" VALUE="1.0.3.0,1.0.3.0,3.0.0.1"/>
<PARAM NAME = "MAYSCRIPT" VALUE="true"/>
<PARAM NAME = "ibioConnectionType" VALUE="servlet"/>
<PARAM NAME = "ibioPPVhostname" VALUE="https://myserver"/>
<PARAM NAME = "ibioPPVportnumber" VALUE="11443"/>
<PARAM NAME = "ibioPPVDAM" VALUE="com.ibiomatics.analysis.server.demoDAM"/>
<PARAM NAME = "ibioPPVProjectID" VALUE="NDA"/>
<PARAM NAME = "ibioPPVStudyID" VALUE="NDA~PHCSAMPLE"/>
<PARAM NAME = "ibioStudyManagerClass" VALUE="com.ibiomatics.analysis.server.ppvStudyManager"/>
<PARAM NAME = "ibioGDBenabled" VALUE="false"/>
<PARAM NAME = "lookAndFeel" VALUE="metal"/>
</APPLET>
</BODY>
</HTML>
Thanks in advance,
Drew

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