In Fancybox, the title attribute in the <a href> is used to hold the description for the image popout.
The browsers default behaviour on mouseover of an <a href> tag is to show the title attribute in a tooltip box.
If the description is lengthy or contains html tags, then the default tooltip behaviour displays inappropiately.
In order to avoid this behaviour, I have altered the fancybox js and css files to use the alt attribute in the <a href> tag. This negates the default behaviour completely when an alt attribute replaces the title. See the source code below: