Small Basic Content Management System

I am working on a website which has a page that has links to different sections of the website: Notes from Dr. Sandler, Conferences, Parent Comments, What Our Kids Are Saying. Each page is going to need to be updated semi-regularly. Ideally Here is what I am looking to have made - a simple admin script that would allow the client to login securely to the site and choose the page content they want to update (ie. conferences, notes, parents feedback, childrens feedback). Once they pick the section, they are taken to a page that loads a toolbar with different formatting options (like in Wordpress - font, size, color, etc) and then the text box where they type/paste the new content. Then they hit save/update and it posts the content to the page. Each update would act as a new post, so the older content would just be below it (and then could be deleted later). Basically a very simplified blog feature I suppose. If you have any questions, please ask.