在Sharepoint 2007网站上实施页面投票？

I develop a website in Sharepoint 2007. I have pages that have a richhtmlfield with content. I need to add the possibility to add comments by any user and the option to rate the page with a dropdownlist with values from 1-5, then sum all the votes and show a global rate for the page. i don't know how to do this in Sharepoint or what are my options.I develop a website in Sharepoint 2007. I have