Problem instantiating a menu object

[tf.alves]

Hello everyone, I'm a beginner dealing with ExtJS, and I have a problem.
What is the proper way to instantiate a menu type object?
I tried:
var m = new menu();
var m = new Ext.Menu();
var m = new Ext.menu();

All to no avail, firebug tells me that this is not a constructor. What am I doing wrong? Am I supposed to link another .js file? how?

Thanks!

[jay@moduscreate.com]

It's

new Ext.menu.Menu({
    items : [ /* your items here */]
});

[tf.alves]

It's

new Ext.menu.Menu({
    items : [ /* your items here */]
});

Thanks! It worked like a charm