/**
* This function will work cross-browser for loading scripts asynchronously
*/
function loadAsync(src, callback) {
var scriptTag,
ready = false;
scriptTag = document.createElement('script');
scriptTag.type = 'text/javascript';
scriptTag.src = src;
scriptTag.onreadystatechange = function() {
// console.log( this.readyState ); //uncomment this line to see which ready states are called.
if (!ready
&& (!this.readyState || this.readyState == 'complete')
) {
ready = true;
typeof callback === 'function' && callback();
}
};
scriptTag.onload = scriptTag.onreadystatechange
document.getElementsByTagName("head")[0].appendChild(scriptTag)
}