jquery - Fancybox set content source class name -

using fancybox 2, i've been able trigger content source types via class on triggering element. example, <a href="..." class="fancybox.iframe">...</a> trigger iframe.

i'm updating fancybox v1 on existing code base, , adding these classes each link isn't particularly desired.

i can:

• add class dynamically js (each link has class of iframe jquery hook onto, add right class on top of on page load)
• somehow change settings of fancybox 2 pickup iframe class , use instead of fancybox.iframe.
• add type: iframe call options.

for sake of compatability, i'd go second option, there's nothing on documentation on whether it's possible.

is possible change class fancybox looks detect content source?