JavaScript /CSS programmer

I have a survey widget (that uses html, JavaScript and css) that I need help Upgrade to see actual info's not displaying properly because it seems like there might be issues with timing. Once this one is working, I need to create 2 additional similar surveys with slightly different functionality. If you also know MySQL there's a potential for follow up work to help automate creating customized versions of these widgets.

For the first widget I have this code snippet that injects the widget into any website: function callScript(src) {
var script = document.createElement('script');
script.src = src;
Upgrade to see actual infofer = true;
document.head.appendChild(script);
}

callScript('Upgrade to see actual info');

The widget is hosted in a google cloud bucket.