How to customise throbber (spinning wheel icon) between pages?

@dsweeney , you can create a descriptive question and add a .gif image of spinning wheel icon with desired text. and with some delay (using JS or auto submit option of Qualtrics)

I haven't figured this out yet, but just sharing some progress. The throbber is in a div called '.pace' that has a '.pace-activity' div and the animation is controlled by CSS. In the browser I can add some text using the following:
```
<script type="text/javascript">

var pacers = $$('.pace');
if (pacers.length > 0)
{
var message = document.createTextNode('Please wait while we');
var br = document.createElement('br');
var div = document.createElement('div');
div.appendChild(message);
div.appendChild(br);
pacers[0].appendChild(div);
div.style = 'position: absolute;top: 40%;left: 0;right: 0;display: block;margin: auto;text-align: center;color: #fff;';
}

</script>
```
However, if I load this in the Header section of Look and Feel it doesn't work. So the header isn't instantiated here. So, if anyone knows how to get JS working in this context I'd be grateful.