I am rather new to JQuery but this is really something I can't get my head around...

I've got this code:

2. $('select').change(function() {
3.     pos = $(this).attr("id");
4.     if (pos == "sector" && $('#sector').val() == 2) {
5.         $('#TextAreaDiv').fadeIn("slow");
6.     }   
7.     else {
8.         $('#TextAreaDiv').fadeOut("slow");
9.     }
10. });
11. 
    
12. var i= 0;
13. function addField(){
14.     $('#TextAreaDiv').append('<input type="text" name="myinput'+i+'" />');
15.     i++;
16.     return false;
17. }

If I put this in my .php file where the div is created it works, but if I include from an external file in doesn't react. Could anyone give me push in the right direction?

ps. Yes the link to include is CORRECT! ;)