My role, curiously, was the same; my step-daughter-in-law's family had disowned her (specifically for marrying my step-son), so I filled the function of the bride's father throughout, including the speech at the reception. Her mother made it to the church, which was a bit awkward. My difference in style was more a matter of what my daughter wanted - it was the first time I've worn a waistcoat since 1963, when the late Queen Mother visited my school and the senior scholars had to wear court dress.
On May's pictures, I used the Firebug extension in Firefox to look at the Javascript in the page with the picture on. This is unformatted, but Firebug tidies it up enough to find the url; The equivalent in Opera (Butterfly, which is built in, not an addition) doesn't do the reformatting. I think to get a larger size, I would have to add something to the url, which the Javascript would do, but I'd have to decode the whole lot to work out what that was (though once done, always remembered, of course!).