No-Library (pure JS), HTML, CSS, JavaScript
http://stackoverflow.com/questions/14964253/how-to-dynamically-add-a-new-column-to-an-html-table/14964991#14964991
jQuery 1.7.2, HTML, CSS, JavaScript
jQuery 1.5.2, HTML, CSS, JavaScript
Example
jQuery 2.0, HTML, CSS, JavaScript
jQuery 2.0.2, HTML, CSS, JavaScript
jQuery 1.6, HTML, CSS, JavaScript