Shortest HTMLEntities in JavaScript ever

htmlentities.js

/* From Ben McMahan:
http://www.quora.com/What-are-the-most-interesting-HTML-JS-DOM-CSS-hacks-that-most-web-developers-dont-know-about/answer/Ben-McMahan

Example usage:
HTMLEntities('<div id="foo">bar</div>');   // '&lt;div id="foo"&gt;bar&lt;/div&gt;'

*/

function HTMLEntities(a) {
    var b = document.createElement('a');
    b.innerText = a;
    return b.innerHTML;
}


/* And a decoder inspired by the above code
   Usage: HTMLEntitiesDecode('&lt;div id="foo"&gt;bar&lt;/div&gt;');   // '<div id="foo">bar</div>'
*/
function HTMLEntitiesDecode(a) {
    var b = document.createElement('a');
    b.innerHTML = a;
    return b.innerText;
}