The working form of the link is as:
		<a href="images\image-1.jpg" title="This will be the caption">image #1</a>

If I understand this correctly, it is defined in the js file here:

		var objNumberDisplay = document.createElement("span");
		objNumberDisplay.setAttribute('id','numberDisplay');
		objImageDetails.appendChild(objNumberDisplay);
Which becomes:
		<span id="caption"></span>

I'm trying to have the output something as:
		<span id="caption"><?imgString(caption,15);?></span>