ahah. Try find in your blogger settings the option to "make an excerpt" out of your posts. Otherwise I do not know, I once used blogger but have moved over Wordpress for these kind of settings. this post might help : http://technicallyeasy.net/2008/10/how-to-display-post-excerpts-in-blogger/
Thanks Airboy, I'll give it a try..!
Pick up the interphone, make your announcement!