webP feature detect

gistfile1.js

/* 
  webP feature detect by jameswestgate 
  http://queryj.wordpress.com/2012/06/11/detecting-webp-support/
*/

function testWepP() {
    var webP = new Image();     
     webP.src = 'data:image/webp;base64,UklGRjoAAABXRUJQVlA4IC4AAACyAgCdASoCAAIAL' + 
'mk0mk0iIiIiIgBoSygABc6WWgAA/veff/0PP8bA//LwYAAA';
     webP.onload = webP.onerror = function () {
         callback(webP.height === 2);     
     }; 
};

testWebP(function(supported) {
     console.log((supported) ? "webP supported!" : "webP not supported."); 
});