If youd like to change the title attribute used in fancybox v2 to fancyboxtitle, this is how. The reason I needed to change it is because I need to use the regular title attribute for slightly different tooltip/alt text.
if (isQuery(element)) {
obj = {
href : element.data('fancybox-href') || element.attr('href'),
title : element.data('fancybox-title') || element.attr('fancytitle'), /* Changed to fancy-title*/
isDom : true,
element : element
};