Using tag OBJECT on a machine with multiple jre versions

Dear friends,
i guess that this question has been already answered, but i can't find the thread with all infos i need.
So please excuse me if i'm redundant.
This is my problem:
i have a web application that runs an applet, embedded in an html page;
by now the applet is loaded with the standard tag <APPLET>.
I found many Sun's official pages talking about the use of OBJECT tag to specify the jre version that is supposed to run the applet.
I tried many ways but i can't reach the way to avoid loading the applet with the latest jre installed on my pc.
Here is the code of my OBJECT:
<OBJECT NAME="client" CLASSID="clsid:CAFEEFAC-0014-0002-0009-ABCDEFFEDCBB" HEIGHT="38" WIDTH="335" >
                      <PARAM NAME="NAME" VALUE="client">
                      <PARAM name="type" value="application/x-java-applet;jpi-version=1.4.2_09">
                         <PARAM NAME="CODE" VALUE="it.fabio.client">
                         <PARAM NAME="CODEBASE" VALUE="/myapp">
                         <PARAM NAME="ARCHIVE" VALUE="mylib.jar">          
               </OBJECT>The machines where the application is deployed have the 1.4.2_09 and the 1.5.0_03 jre versions, but my applet runs only on 1.4.2_09 version.
So i have to find a way to tell the browser which jre has to be called.
Thanks in advance for help.
Regards

Wait a second...there is more to that error message that I overlooked before.
There might be something other than just the way I set the CODE and CODEBASE parameters wrong here
Any ideas?
Here is the entire messsage:
load: class DisplayMonoApplet.class not found.
java.lang.ClassNotFoundException: DisplayMonoApplet.class
     at sun.applet.AppletClassLoader.findClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadClass(Unknown Source)
     at java.lang.ClassLoader.loadClass(Unknown Source)
     at sun.applet.AppletClassLoader.loadCode(Unknown Source)
     at sun.applet.AppletPanel.createApplet(Unknown Source)
     at sun.plugin.AppletViewer.createApplet(Unknown Source)
     at sun.applet.AppletPanel.runLoader(Unknown Source)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)
Caused by: java.io.IOException: open HTTP connection failed.
     at sun.applet.AppletClassLoader.getBytes(Unknown Source)
     at sun.applet.AppletClassLoader.access$100(Unknown Source)
     at sun.applet.AppletClassLoader$1.run(Unknown Source)
     at java.security.AccessController.doPrivileged(Native Method)
     ... 10 more

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    As a user, I need to access two web site, one requires jre 1.2.2, and the other requires jre 1.4. But once I got 1.4 installed, the one requiring 1.2.2 stops working. I went to jre 1.4 plug-in console, tried switching versions from the advanced tab, but 1.2.2 was not even on the drop down list. (If I have jre 1.3 installed, I can see those in the list.) If I choose "other", I got a pop up window stating it is not recommanded, I acknowledged it, and manually enter my jre 1.2.2 there, but I still can not access that web site requiring jre 1.2.2. I guess you can switch between 1.4 and 1.3 smoothly, (as matter of fact, the related documentation I browsed are about between 1.3 and 1.4) but anyone out there successfully switched between 1.4 and 1.2.2?
    Thanks!
    Jun

    Pre 1.3.1_01a versions (I think that's the right one, might want to check) won't co-exist with any other version. Later versions are designed to cohabit.

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