How to add a function to jQuery?

Please see “Defining your own functions in jQuery” by Basil Goldman:

In this post, I want to present how
easy define your own functions in
jQuery and using them.

Modified, based on the code in the blog post linked above:

jQuery.fn.yourFunctionName = function() {
    // `this` is the jQuery Object on which the yourFunctionName method is called.
    // `arguments` will contain any arguments passed to the yourFunctionName method.
    var firstElement = this[0];

    return this; // Needed for other methods to be able to chain off of yourFunctionName.
};

Just use:

$(element).yourFunctionName();