How to by pass downloading lower versions of Java Plugin ?

I have developed an applet which uses Java plug-in version 1.3.1. One of my friends is using 1.3.1.0.1a. I guess that this is the latest version. But program downloads 1.3.1 Java plug-in. How to bypass downloading lower versions of Java Plug-in if higher version is already installed on client machine ?
Can anyone of you help me in this regard ?
Thanks,
Murali

OK, I am still getting duplicate JRE/Plug-ins installed side by side after trying this fix. Here are the steps I took (windows 2000, ie6):
1. uninstalled JRE 1.3.1
2. manually installed JRE 1.3.0 from sun site, verified it was installed and corresponding plug-in appears in control panel.
2. modified applet startup page to contain "1.3" as suggested:
PARAM NAME="type" VALUE="application/x-java-applet;version=1.3"
(left html-generator-created page containing object tag pointing to 1.3.1, as follows:)
if (_ie == true) document.writeln('<OBJECT classid="clsid:CAFEEFAC-0013-0001-0000-ABCDEFFEDCBA" WIDTH = 750 HEIGHT = 450 codebase="http://java.sun.com/products/plugin/1.3.1/jinstall-131-win32.cab#Version=1,3,1,0"><NOEMBED><XMP>');
3. ran applet page. it proposed downloading 1.3.1.
4. responded 'no' to install. applet page opens blank.
5. closed and retried applet page, responding 'yes' to 1.3.1 install. that install runs fine, applet starts, but both 1.3.1 and 1.3 JREs and plugins are present on the workstation.
6. uninstalled 1.3 JRE, leaving 1.3.1 JRE, retried applet page. small black box appears in applet's place, and something appears to be downloading very very slowly.
7. uninstalled 1.3.1 JRE, retried applet page, allowed normal plugin download install, applet worked fine.
I have not yet tried specifying an earlier JRE in the tag, and having a later JRE already on the workstation, although I would not be surprised to see duplicate JREs installed in this case as well..
We have had sporadic reports of people having workstations that simply would not run the applet when multiple JREs were present after the autodownload forced by this applet page. Also, IS departments are not going to like having standard environments updated whenever Sun wants, much less having defective configurations created. There really needs to be a way to prevent this problem.
Note: I did not modify the classID/codepath part of the html-generator page with the above suggestion about MIME type, since I did not see how it could be done.
Any ideas?
Also, a comment was made that the html-generator becomes obsolete in 1.4 plugin. When will this be, and does this change modify the way the OBJECT tag is written, so that this problem doesn't keep occuring?
Thanks,
Kevin

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