var $$ = function(id) {
return "string" == typeof id ? document.getElementById(id) : id;
};
var Extend = function(destination, source) {
for (var property in source) {
destination[property] = source[property];
}
return destination;
}
var CurrentStyle = function(element) {
return element.currentStyle || document.defaultView.getComputedStyle(element, null);
}
var Bind = function(object, fun) {
var args = Array.prototype.slice.call(arguments).slice(2);
return function() {
return fun.apply(object, args.concat(Array.prototype.slice.call(arguments)));
}
}
var forEach = function(array, callback, thisObject) {
if (array.forEach) {
array.forEach(callback, thisObject);
} else {
for (var i = 0, len = array.length; i < len; i++) { callback.call(thisObject, array[i], i, array); }
}
}
var Tween = {
Quart: {
easeOut: function(t, b, c, d) {
return -c * ((t = t / d - 1) * t * t * t - 1) + b;
}
},
Back: {
easeOut: function(t, b, c, d, s) {
if (s == undefined) s = 1.70158;
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
}
},
Bounce: {
easeOut: function(t, b, c, d) {
if ((t /= d) < (1 / 2.75)) {
return c * (7.5625 * t * t) + b;
} else if (t < (2 / 2.75)) {
return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
} else if (t < (2.5 / 2.75)) {
return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
} else {
return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
}
}
}
}
var SlideTrans = function(container, slider, count, options) {
this._slider = $$(slider);
this._container = $$(container);
this._timer = null;
this._count = Math.abs(count);
this._target = 0;
this._t = this._b = this._c = 0;
this.Index = 0;
this.SetOptions(options);
this.Auto = !!this.options.Auto;
this.Duration = Math.abs(this.options.Duration);
this.Time = Math.abs(this.options.Time);
this.Pause = Math.abs(this.options.Pause);
this.Tween = this.options.Tween;
this.onStart = this.options.onStart;
this.onFinish = this.options.onFinish;
var bVertical = !!this.options.Vertical;
this._css = bVertical ? "top" : "left";
var p = CurrentStyle(this._container).position;
p == "relative" || p == "absolute" || (this._container.style.position = "relative");
this._container.style.overflow = "hidden";
this._slider.style.position = "absolute";

this.Change = this.options.Change ? this.options.Change :
this._slider[bVertical ? "offsetHeight" : "offsetWidth"] / this._count;
};
SlideTrans.prototype = {
SetOptions: function(options) {
this.options = {
Vertical: true,
Auto: true,
Change: 0,
Duration: 30,
Time: 10,
Pause: 3000,
onStart: function() { },
onFinish: function() { },
Tween: Tween.Quart.easeOut
};
Extend(this.options, options || {});
},
Run: function(index) {
index == undefined && (index = this.Index);
index < 0 && (index = this._count - 1) || index >= this._count && (index = 0);
this._target = -Math.abs(this.Change) * (this.Index = index);
this._t = 0;
this._b = parseInt(CurrentStyle(this._slider)[this.options.Vertical ? "top" : "left"]);
this._c = this._target - this._b;
this.onStart();
this.Move();
},
Move: function() {
clearTimeout(this._timer);
if (this._c && this._t < this.Duration) {
this.MoveTo(Math.round(this.Tween(this._t++, this._b, this._c, this.Duration)));
this._timer = setTimeout(Bind(this, this.Move), this.Time);
} else {
this.MoveTo(this._target);
this.Auto && (this._timer = setTimeout(Bind(this, this.Next), this.Pause));
}
},
MoveTo: function(i) {
this._slider.style[this._css] = i + "px";
},
Next: function() {
this.Run(++this.Index);
},
Previous: function() {
this.Run(--this.Index);
},
Stop: function() {
clearTimeout(this._timer); this.MoveTo(this._target);
}
};