Shifting graphics while mouse move

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Hi NG,

the following problem occurs only with Mozilla Firebird 0.7. In IE 6
everything works fine:

While moving the mouse over the logo in the upper left corner the graphic
(line) below moves about 3 pixels up and stays there.

Do you have any ideas how to prevent the line from moving up? Are there any
CSS rules I can use?

Thank you very much!

Greetings from Germany,

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