SO Help: How to use jQueryUI toggleClass

HTML

Original is RED.
<div id="myFragment" class="original">
   <p id="f1">HERE NO ORIGINAL ITALICS</p>
   <p id="f2">
     <i>F</i>RAGMENT <big><i>with italics</i> and </big> withOUT.
    </p>
    <p id="f3"><i>HERE ORIGINAL ITALICS</i></p>
</div>
<button>Change</button>

CSS

.original {
    background-color: red;
    color: #000;
    font-style:normal;
}
i.original { font-style:italic; }

.change {
    background-color: #000;
    color: #fff;
    font-style:italic;
}
i.change{ font-style:normal; }

JavaScript

$("button").click(function(e) {
    $('#myFragment *').each(function(){
           $(this).toggleClass( "original change");
    });
});

// ppkrauss