UnitApi / js

var includeScript = function(url, target, success, error){

    //url is URL of external file, success is the code

    //to be called from the file, location is the location to

    //insert the <script> element

    var scriptTag = document.createElement('script');

    scriptTag.src = url;

    scriptTag.type = 'text/javascript';

    scriptTag.onerror = error;

    scriptTag.onload = success;

    scriptTag.onreadystatechange = success;

    target.appendChild(scriptTag);

};