Fade issue

[[EMAIL PROTECTED]]

Hi guys, im new to using mootools and I'm trying to setup a fade
effect while content is loaded into a div, the code i have is below.

function loadElement(element,uri) {

    var makeRequest = function() {
            var req = new Request.HTML({
                url:uri,
                        onSuccess: function(html) {
                                gebi(element).adopt(html);
                    fadeIn.start(0,1);
                        },
                        onFailure: function() {
                                gebi(element).set('text', 'The request 
failed.');
                        }
                });
            req.send();
        };

    var fadeIn = new Fx.Tween(element,'opacity',{ duration: 1000 });

    var fadeOut = new Fx.Tween(element,'opacity',{ duration: 1000,
onComplete: makeRequest });
    fadeOut.start(1,0);
};

"gebi" is a utility function of mine, it's simply a wrapper for
getElementById (hence gebi) since i got sick of writing
document.getElementById over and over and over :p

When i try and use the code it dies on fadeOut.start(1,0) with
"G.camelCase is not a function" on line 192, im using 1.2.1 on firefox
2.0.0.13.

Am I doing something obvious and stupid here ?