function fadeIn( elem ) {
    // Start the opacity at  0
    setOpacity( elem, 0 );

    // Show the element (but you can see it, since the opacity is 0)
    show( elem );

    // We�re going to do a 20 �frame� animation that takes
    // place over one second
    for ( var i = 0; i <= 100; i += 5 ) {
        // A closure to make sure that we have the right �i�
        (function(){
            var pos = i; 

            // Set the timeout to occur at the specified time in the future
            setTimeout(function(){

                // Set the new opacity of the element
                setOpacity( elem, pos );

            }, ( pos + 1 ) * 10 );
        })();
    }
}