##if you want to add some animation to a div witch id is "block", see the code

[pre]

// initialize a variable
var ani = new TW();

// left: 0 - 1200, top: 200 - 500
ani.fromTo({
x: 0,
y: 200
}, {
x: 1200,
y: 500
}, 1111).run(function(obj) {
this.style.left = obj.x + "px";
this.style.top = obj.y + "px";
}, document.getElementById("block"));