addLoadEvent(
                function()
                {
                    var divMainRef = $('divMain');
                    divMainRef.style.marginTop = getTopSpaceForCentering(divMainRef) + 'px';
                    divMainRef.style.marginLeft = getLeftSpaceForCentering(divMainRef) + 'px';
                }
            );
addResizeEvent(
                    function()
                    {
                        var divMainRef = $('divMain');
                        divMainRef.style.marginTop = getTopSpaceForCentering(divMainRef) + 'px';
                        divMainRef.style.marginLeft = getLeftSpaceForCentering(divMainRef) + 'px';
                    }
              );

function divBtnShake(divID)
{
    new Effect.Shake(divID, { duration: 0.2, distance: 10 });
}