The only part of this that is actually packageable as files to install is the jscript_whatever.js file described in my post. The rest is to be added to the product description, tailored to the particular product (plus any stylesheet rules, again tailored to the site/product). My take on a generic form for the description (where the "Features" switch is the desired behavior) would be
Code:
<div id="Txt">Features</div>
<img src="/images/yourimage.gif" width="20" height="20"
onmouseover="CngTxt('Txt','Description<br />of features')"
onmouseout="CngTxt('Txt')"
>
Then add to your stylesheet something like
#Txt {width: 100px; height: 50px; border: 1px solid black;}
as well as whatever other styling you want.
The js file needs to be edited to make 'some standard text' read the same as the div content.
It would be good for Paul to post an example of what he actually ended up using.