Capture keycodes inside prototype function

I'm trying to capture keystrokes inside my prototype function. Here's my code: function txtBox(input) // pass textbox { this.id = "myTextbox"; this.txt = input } txtBox.prototype.init = function() { this.txt.bind("keyup",this.keyup); } txtBox.prototype.keyup= function(event) { alert("keycode: event.keyCode); alert(this.id); } var myTxt = new txtBox($(#txt)); // create object myTxt.init(); Capturing works but the problem is that the `keyup` triggers "outside" my object, which means `this.id` returns "undefined" even though it _was_ defined. Does anyone know how to keep consistency with this?

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