lastChild not working

Question

I have the following code:

Answer 1

this is what I would have done, but I'm not clear as to if it's what you want:

$(function () {
    var lastchild = $('#div div:last-child').attr('id');
    alert(lastchild);
});

http://jsfiddle.net/pFjPS/

also, I don't believe classes or ids can start with numbers, so your markup is probably not valid

edit : HTML5 supports it, but is not generally recommended.