Input fields, feedback &Tab Key IE Explorer 8

I have made a page i Lectora which contains several "Fill in the blanks"-questions. When questions are answered, the pupils receives imidiate respons. Problem is: I want to trigger the feedback when the pupils press the TAB-key instead of having to mouseclick outside of the input-field. This works without problem in Mozilla Firefox, but not in IE Explorer. Does anyone know what can be done?

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