function init(){

t1 = new OpacityTween(document.getElementById('sq1'),Tween.Linear, 50, 100, .2);
t1o = new OpacityTween(document.getElementById('sq1'),Tween.Linear, 100, 50, .2);
t2 = new OpacityTween(document.getElementById('sq2'),Tween.Linear, 50, 100, .2);
t2o = new OpacityTween(document.getElementById('sq2'),Tween.Linear, 100, 50, .2);
t3 = new OpacityTween(document.getElementById('sq3'),Tween.Linear, 50, 100, .2);
t3o = new OpacityTween(document.getElementById('sq3'),Tween.Linear, 100, 50, .2);

}