Dynamically add/remove class via Javascript

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get class

document.getElementById('id').classList
document.getElementById('id').className

add/remove

document.getElementById('id').classList.add('class');
document.getElementById('id').classList.remove('class');

add/remove using JQuery

$j('#MyElement').addClass('MyClass');
$j('#MyElement').removeClass('MyClass');
$j('#MyElement').toggleClass('MyClass');

Source:
http://stackoverflow.com/questions/195951/change-an-elements-css-class-with-javascript

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