Manually remove a line of code from 490 blogger posts

I have a blog with 570 blog posts and they are not transferring to WordPress properly. I need somebody in the next few hours to go post by post and pull out the following line of code from the HTML section of each post: <!--more--> or <span id="fullpost"> with closing span tag </span> (in some of the earlier posts) Each post will have one or the other, and I'm not sure when I switched from <span id="fullpost"> to <!--more-->. I do not need it pulled from any posts dated before 09/18/2010 and it may not be in every post after that date. After removing it, you simply hit publish post again and go to the next post (you'll definitely want to open the posts in new tabs so that you're not constantly waiting for the edit posts screen to reload). User must remain within the blog editing screen and individual post editing screens and not touch any other sections of the Blogger control panel. I need this done in the next few hours (shouldn't take more than a couple hours to go through all of them). Anybody need a quick job to make a few extra bucks? Dan