jQuery animate and property values in percentage

It seems as though theres a bug with using a percentage with animate. http://bugs.jquery.com/ticket/10669

I would suggest calculating the number of pixels to add yourself, something like this may work:

percent = 0.25;
add_width = (percent*$('#innerBox').parent().width())+'px';
$('#innerBox').animate({'width': '+='+add_width}, 3000);

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