Why is my for loop not incrementing?

I declare the variable i to equal 2, and for testing I have an aleart box popup with the value at i, which is equal to 2, then after the for loop I have another alert box which is equal to i, which should be 4 but is 2 instead. This means my for loop is not incrementing. What did I do wrong?

        var i = 2;

            alert("Test: " + i);
        for (i = 2; i > 4; i++);
        {
            TFor="Tab" + i;
            BFor="Body" + i;
                       //i = i + 1;
        }
        alert("Test: " + i);

thanks,
Donrafeal7

the problem is on this line:
i'm sure you wanted to write instead of and also you mustn't have a semicolon after the closing brace