[Moo] shift enter

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Hello,
i would like to check my form for shift-enter
shift-enter should be allowed. On enter the form should submit.


$('chatText').addEvent('keydown',function(event){
    if ((event.key=='enter') && (event.key!=16)) {
                        alert("ENTER");
        }
    });

This code do not take care of shift and allerts on enter and on shift-
enter.
whats wrong.
thanks for any help in advance