[advAjax] problem advAjax not defined Opcje

[piotrekkr]

witam

Kod

JavaScript - http://127.0.0.1/IDU/index.php?p=1&action=add_teacher_form
Event thread: change
Error:
name: ReferenceError
message: Statement on line 7: Reference to undefined variable: advAjax
Backtrace:
  Line 7 of inline#1 script in http://127.0.0.1/IDU/index.php?p=1&action=add_teacher_form
    advAjax.get({url : "getClasses.php?school_id=" + schoolid, onSuccess : (function (obj)
{
  document.getElementById("classes").innerHTML = obj.responseText;
}
), onError : (function (obj)
{
  alert("Error: " + obj.status);
}
)});
  Line 1 of  script
    listClasses(this.options[this.selectedIndex].value);
  At unknown location
    [statement source code not available]

takie cos mi wyrzuca opera

a to kod javascript na stronie:

[HTML] pobierz, plaintext 
<script type="text/javascript" language="JavaScript" src="js/advajax.js"></script>
<script type="text/javascript" language="JavaScript">
function listClasses(schoolid){
	advAjax.get({
		url: "getClasses.php?school_id="+schoolid,
		onSuccess : function(obj) {document.getElementById('classes').innerHTML= obj.responseText; },
		onError : function(obj) { alert("Error: " + obj.status); }
	});
};
</script>
[HTML] pobierz, plaintext 

mecze sie z tym juz caly dzien :/ mam advAjax zadeklarowana przeciez w pliku advajax.js nie wiem o co chodzi to samo mi firefox wyrzuca znaczy nie to samo ale tez ze advAjax not defined. Prosze o pomoc