How to create own voting system

Today I prepared very interesting article – today I will tell you how you can create own voting system for your items (any units at your website) with PHP. I prepared two SQL tables: first table will keep our demo items. It contain several fields: title, description, time of adding, rate value and count of rates. Another table will keep records of voting (track). Of course – we will use jQuery too (for better behavior of interface). One of features will restriction to vote twice from one IP during 1 week!