JQuery Ajax manager problem in IE

JQuery Ajax manager problem in IE

Hello Guys, I was trying out Jquery's Ajax manager. All seams well in FF but there is some problem on IE.
Here is my JS code

$.manageAjax.create('clearQueue', {queue: 'clear', maxRequests: 2});
$.manageAjax.add('clearQueue', { success: function(html) { alert("hi"); }, url: 'ietest.php' });

This on IE gives error that says: "$.manageajax is null or not an object error".

Can any body help me out on this.

Thanks in Advance,