if you really want to add 1, you can'T do this in j@vascript. you could do it with a random number/key but again you risk to have 2 similar form number.
for this kind of thing you definitly should just use a DB MySQL with PHP wich it's ID column is AUTO_INCREMENT PRIMARY KEY
contact me to give me more info or if you want more etc, but I'm going to sleep right now so catch you tomorrow unless you found someone else
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