On the 'General' tab of the iRite interface, did you check the box that says 'Set focus on load' ?
If so, uncheck that box and upload the iRite javascript file with new setting.
Alternatively just change the line in the relevant iRite .js file from
FCKConfig.StartupFocus = true;
to
FCKConfig.StartupFocus = false;
and upload the javascript file.