Change your javascript call to the following:
$(document).foundation('reveal', {animation: 'none'});
Here's jsFiddle: http://jsfiddle.net/pSQjj/1/
At least in this jsFiddle there is an error with closing the modal window with the animation set to none , while it closes correctly if you change the configuration to fade or fadeAndPop . Let me know if you see the same error in your application, and I will report it to the guys and guys in Zurb.
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