Convert graphics to transparent edges, post to new wordpress site

Convert all graphics found in the bodies of the pages under the "where we work" pages and "donate" pages including "donate" daughter pages of [login to view URL] to make the edges transparent for a new background we'll be using at our new website. (Right now all of the photos have white edges that do not look right on the cream-colored background of the new site). However, no need to convert graphics found under "Alternative Gift Catalog" Our new website is being managed via Wordpress, so the second step of the project is that you'll need to log in there and post all of the photos in the same locations as they were on the previous site. I will give you detailed instructions as to how i'd like to see the alignment of the photos, placement, etc. I'm not certain but I believe we're definitely talking about fewer than 100 graphics. Time is of the essence so I'll be looking for bidders who can get this turned around quickly. Thank you.