I NEED HELP!!!!!!!!!!!!!!!!!!!!!!

I need to make some "programs" in JavaScript...

1. A program that "calculates" a person age.
2. A program that "write" the first 50 multiples of 3.

Also..........

How can i know if a string is a text or a numeric one?
How can i "write" text a document already loaded?

Thanks

Code:

---

<script>
function MultipleOf(Num)

  {

    var OldNum=Num;

    for (i=1; i<51; i++)

        {

            document.write(Num + " ");

            Num += OldNum;

        }
  }


function AgeFromYear(TheYear)

  {

    var NewYear = 2000 - TheYear;

    document.write("you are " + NewYear + " years old");

  }

</script>

---

[Edited by denniswrenn on 08-13-2000 at 03:36 PM]