JavaScript - SetInterval doesn't function properly

Question

I got this piece of script (runned locally):

Answer 1

You need to pass a reference to the function instead of calling it.

This:

setInterval (uploadnew(), 1000*60*5);

should be:

setInterval (uploadnew, 1000*60*5);

If you were to call it as you were, you would need to have uploadnew() return a function to be passed to setInterval.

function uploadnew() {
    return function(){
        var randomnumber=Math.floor(Math.random()*6);
        if(randomnumber != last) {
            document.forms['f'+randomnumber].submit();
        } else { uploadnew()(); }
    }
}

Note the change to the recursive call.