<div id="mcts1">
<img src="images/thumbnail-slider-1.jpg" onmouseover="tooltip.pop(this, 'This is the first slide')" />
<img src="images/thumbnail-slider-2.jpg" onmouseover="tooltip.pop(this, '#tip2')" />
<img src="images/thumbnail-slider-3.jpg" onmouseover="tooltip.pop(this, '#tip3')" />
... ... ...
</div>
// You just need to pass in the element ID starting with "#", tooltip.pop(this, '#tip2').
// The element of "#tip?" contains the tooltip HTML content on the page. You can view the source code of demo4.html for details.