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// First, let's define a widget/plugin called "foo"

// Either using jQuery's $.fn plugin namespace, for simple stateless plugins...
$.fn.foo = function(){

  // In this scope, this refers to the element on which the plugin foo() was called 
  // manipulate it and return this at the end, so it can be chainable

};

frequent

<!-- Mobile meta & links -->

<!-- Reference

Custom Icon and Image Creation Guidelines:
http://developer.apple.com/library/safari/#documentation/UserExperience/Conceptual/MobileHIG/IconsImages/IconsImages.html

Configuring Web Applications:
http://developer.apple.com/library/safari/#documentation/appleapplications/reference/safariwebcontent/configuringwebapplications/configuringwebapplications.html

frequent

<img src="large-default-file.jpg">
    <source src="smaller.jpg" media="max-width:600px">
    <source src="tiny.jpg" media="max-width:320px">
</img>