FULL PRODUCT VERSION :
java version "1.6.0_10-beta"
Java(TM) SE Runtime Environment (build 1.6.0_10-beta-b22)
Java HotSpot(TM) Client VM (build 11.0-b11, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [version 5.1.2600] French edition

EXTRA RELEVANT SYSTEM CONFIGURATION :
Opera 9.26
Safari 3.1

A DESCRIPTION OF THE PROBLEM :
If you use the deployment toolkit to deploy an applet, Opera and Safari users will be redirected to the Java downloads for all operating systems page on Java.com. Even if they have the latest version of Java installed.

Even if the browser are not officially supported with the deployment toolkit I think that the default behaviour should be to display the applet as requested.

There is for all browser a navigator.javaEnabled() JavaScript function that maybe give a hint.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Go to http://www.japplis.com/resources/blogs/TestDT.html with Opera or Safari on Windows.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Something like http://www.japplis.com/jlearnit/dicos/english-french.html
ACTUAL -
http://java.com/en/download/manual.jsp?host=java.com&returnPage=http://www.japplis.com/resources/blogs/TestDT.html&locale=en

REPRODUCIBILITY :
This bug can be reproduced always.

CUSTOMER SUBMITTED WORKAROUND :
Write a Javascript function that detect the browser and call deployJava.js only when it's IE or Mozilla.