Reload Problem, user tend to submit data twice

[eluser]Référencement Google[/eluser]
This is what I would do:

- Each form load generate a random ID
- Each submited form put this form ID in a DB field (was suggested by Xwero in #5)

Then you can do something like:

if (form ID exists in the DB)
{
Show error form already submited
}
else
{
Process the form
}