add new feature to classified script - easy job

my site is at [login to view URL] I need several things done: (1) fix this error: Warning: Invalid argument supplied for foreach() in /home/every55/public_html/[login to view URL] on line 61 (2) add a feature to let users revert a post back to a previous edited version. See my attachment. when users edit, it writes to the database, yet it doesn't overwrite the old/previous version. this way the post can be reverted back in case of spam. (3). on the post page, add a simple (thumbs up) (thumbs down) button. all it does is record it in the database. (4) on the front index page, where it says "view count", I'd like to change it to "edited" and show the total # of edits instead of # of views. pretty easy job. No more than $40.