Possible voting? I got smart visitors

[rene99]

Hello,

Is is possible that when someone vote for a image, that the user isn't allowed to vote for 1 month.
Voting is only for registered users.

I noticed that someone was voting for an image all the time I saw the rating go up and up, so I tried it and everytime i get an mesage you already voted for this image. So I asked that person how he does that and he says:
Ok when I vote i see this in the urladress:

http://www.test.com/details.php?image_id=17&sessionid=UZiI2cjrlKkS5BRqXZDgz3HKYWW04rRb

So I delete the sessionid and refresh the page, and I can vote again.

So my question is is there a way to protect this ??
please advice.
best regards:
Rene

[seanne1]

rene99,

Did you ever find a solution to your problem?  I have the same problem.