addClass, removeClass and hasClass without jQuery

Class manipulation methods in jQuery are really handy, but when you need just them and nothing else out of jQuery, then using entire library seems like a little bit mistake. Using own versions of addClass, removeClass and hasClass sounds like a better idea and for this reason I have wrote following article, where you'll find an example implementation of these methods.

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Dropdown must use both onChange and onKeyPress events

Bear in mind that when writing JavaScript / jQuery code for handling user changes made to dropdown boxes, you must program your website reaction not only to onChange but also to onKeyPress events. Why? There is a rare situation, where user selects value by clicking dropdown and then using keyboard's cursor up or cursor down keys. onKeyPress event will be fired in this situation instead of onChange event. And desired effect won't work, if you put it only to onChange event handler.

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