onSubmit="fillOS();

function fillOS()
{
       document.logonform.osType.value = navigator.userAgent;
       setCursor('wait');
}

This is not tomcat related i would daresay, but it's easily possible (wtih firefox and opera) to manipulate the userAgent in the browser. Everyone could leave the browser identification empty.

Try
navigator.platform
too, if you want to get another chance to identify the os type of the user.

Chris.

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