Rating system help

[sciwaysoft]

I have a picture gallery. An for that i want to creat a rating system.
For this I have a database with a table containing picture data.

My table looks like this.

imageid | source | totalvotes | totalpoints.

1---------34.gif---------4------------ 32
2 --------22.jpg---------2------------13

I want to make a drop down having 1-10 numbers and want to add tha points 1-10 on choice to tha table field totalfields. An in the same time want to increase the totalvotes field by 1.

I wan to disallow rating the same picture more than once by the same user. But want to allow user to rate more than one picture in the same session. Any help .. I am very new to php and want you to help me with code... thanks in advance...

[mrhappiness]

you have a table users containing all data concerning your users (primary key: userid)

you have a table images with primary key imageid

now you create a 3rd table called votes with three columns:
userid | imageid | points
primary key is the combination of userid and imageid

if user with id 75 (stored in session?) rates image with id 789 and gives it 3 points your table looks like
75 | 789 | 3

to get the pic's rating try something like this (in phpmyadmin to see the results)

SELECT
  i.imageid, i.source,
  AVG(v.points) rating
FROM
  images i
  LEFT JOIN votes v ON i.imageid = v.imageid
GROUP BY
  i.imageid, i.source