Terry Chay

This allows you to create a simple image mouseover feature by adding properties to an image:
It understands the following attributes which can be added to the HTML:
<ul>
<li>img.class=”mouseover” (activates IMG mouseover for this image)</li>
<li>img.oversrc (If specified, this rewrites the image on mouse rollover)</li>
<li>img.clicksrc (If specified, this rewrites the image on mouse click)</li>
<li>img.noresize (If set, this will make the image have the natural dimensions instead of the dimensions of the original image).</li>
<li>a.class=”mouseover” (activates A tag as a controller for another image, when clicked a class “selected” is tacked on)</li>
<li>a.for (Should be specified to point to target image. Image must be class mouseover)</li>
<li>a.for_link (If specified the ID of a link is replaced with this one)</li>
<li>a.src (If specified, the click will replace the image with this)</li>
<li>a.oversrc (If specified, the click will replace the image mouse rollover with this)</li>
<li>a.clicksrc (If specified, the click will replace the image mouse click with this)</li>
</ul>

IMG Mouseover

Embed a mouseover image into a regular image tag without resorting to hacky inline Javascript.

etruel

Show a HTML code when you place the [WPeBanOver] shortcode, on mouse (over, out, click, dblclick) show another HTML code until mouseout, anywhere in your template, post, page or widget.
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WPeBanOver

Show a small banner and on mouse event (over, out, click, dblclick) show another big or 2nd banner anywhere in your template, post, page or widget.

IMG Mouseover vs WPeBanOver