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Howto display a dialogue window triggered by a value during data input?

Here is what I want to set up:
Someone is entering/editing an Account. If one Account field has a certain value/input, a dialogue window should be displayed, having two possible option buttons/links ("Yes"/"No"). If the user clicks on any of these buttons, some fields of the current Account should be updated accordingly.
Is there any way to accomplish this - apart from Apex Code, which is not available for me atm?