window.addEvent('domready', function(){
var fx = new Fx.Tween('slide_box_sz', {
duration: 500,
transition: 'quint:in'
});
fx.set('width', '40px');
fx.addEvent('complete', function(){
});

var to = 40;
$('slide_box_sz').addEvent('click', function(){
//fx.start('width', 40, 320);
fx.start('width', (to == 40 ? (to = 320) : (to = 40)));
//fx.cancel.delay(100, fx);
});
})