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In Javascript, you can extend existing classes by using its prototype object:
String.prototype.getFirstLetter = function() { return this[0]; }; Is it possible to use this method to extend DOM elements?
you can extend the DOM by using the Element’s prototype. However, this does not work in IE7 and earlier. You will need to extend the specific element, one at a time. The Prototype library does this. I recommend looking through the source to see exactly how it’s done.