always );
}

function propFilter( props, specialEasing ) {
var value, name, index, easing, hooks;

// camelCase, specialEasing and expand cssHook pass
for ( index in props ) {
name = jQuery.camelCase( index );
easing = specialEasing[ name ];
value = props[ index ];
if ( jQuery.isArray( value ) ) {
easing = value[ 1 ];
value = props[ index ] = value[ 0 ];
}

if ( index !== name ) {
props[ name ] = value;
delete props[ index ];
}

hooks = jQuery.cssHooks[ name ];
if ( hooks && "expand" in hooks ) {
value = hooks.expand( value );
delete props[ name ];

// not quite $.extend, this wont overwrite keys already present.
// also - reusing 'index' from above because we have the correct "name"
for ( index in value ) {
if ( !( index in props ) ) {
props[ index ] = value[ index ];
specialEasing[ index ] = easing;
}
}
} else {
specialEasing[ name ] = easing;
}
}
}

jQuery.Animation = jQuery.extend( Animation, {

tweener: function( props, callback ) {
if ( jQuery.isFunction( props ) ) {
callback = props;
props = [ "*" ];
} else {
props = props.split(" ");
}

var prop,
index = 0,
length = props.length;

for ( ; index < length ; index++ ) {
prop = props[ index ];
tweeners[ prop ] = tweeners[ prop ] || [];
tweeners[ prop ].unshift( callback );
}
},

prefilter: function( callback, prepend ) {
if ( prepend ) {
animationPrefilters.unshift( callback );
} else {
animationPrefilters.push( callback );
}
}
});

function defaultPrefilter( elem, props, opts ) {
/*jshint validthis:true */
var prop, index, length,
value, dataShow, toggle,
tween, hooks, oldfire,
anim = this,
style = elem.style,
orig = {},
handled = [],
hidden = elem.nodeType && isHidden( elem );

// handle queue: false promises
if ( !opts.queue ) {
hooks = jQuery._queueHooks( elem, "fx" );
if ( hooks.unqueued == null ) {
hooks.unqueued = 0;
oldfire = hooks.empty.fire;
hooks.empty.fire = function() {
if ( !hooks.unqueued ) {
oldfire();
}
};
}
hooks.unqueued++;

anim.always(function() {
// doing this makes sure that the complete handler will be called
// before this completes
anim.always(function() {
hooks.unqueued--;
if ( !jQuery.queue( elem, "fx" ).length ) {
hooks.empty.fire();
}
});
});
}

// height/width overflow pass
if ( elem.nodeType === 1 && ( "height" in props || "width" in props ) ) {
// Make sure that nothing sneaks out
// Record all 3 overflow attributes because IE does not
// change the overflow attribute when overflowX and
// overflowY are set to the same value
opts.overflow = [ style.overflow, style.overflowX, style.overflowY ];

// Set display property to inline-block for height/width
// animations on inline elements that are having width/height animated
if ( jQuery.css( elem, "display" ) === "inline" &&
jQuery.css( elem, "float" ) === "none" ) {

// inline-level elements accept inline-block;
// block-level elements need to be inline with layout
if ( !jQuery.support.inlineBlockNeedsLayout || css_defaultDisplay( elem.nodeName ) === "inline" ) {
style.display = "inline-block";

} else {
style.zoom = 1;
}
}
}

if ( opts.overflow ) {
style.overflow = "hidden";
if ( !jQuery.support.shrinkWrapBlocks ) {
anim.always(function() {
style.overflow = opts.overflow[ 0 ];
style.overflowX = opts.overflow[ 1 ];
style.overflowY = opts.overflow[ 2 ];
});
}
}


// show/hide pass
for ( index in props ) {
value = props[ index ];
if ( rfxtypes.exec( value ) ) {
delete props[ index ];
toggle = toggle || value === "toggle";
if ( value === ( hidden ? "hide" : "show" ) ) {
continue;
}
handled.push( index );
}
}

length = handled.length;
if ( length ) {
dataShow = jQuery._data( elem, "fxshow" ) || jQuery._data( elem, "fxshow", {} );
if ( "hidden" in dataShow ) {
hidden = dataShow.hidden;
}

// store state if its toggle - enables .stop().toggle() to "reverse"
if ( toggle ) {
dataShow.hidden = !hidden;
}
if ( hidden ) {
jQuery( elem ).show();
} else {
anim.done(function() {
jQuery( elem ).hide();
});
}
anim.done(function() {
var prop;
jQuery._removeData( elem, "fxshow" );
for ( prop in orig ) {
jQuery.style( elem, prop, orig[ prop ] );
}
});
for ( index = 0 ; index < length ; index++ ) {
prop = handled[ index ];
tween = anim.createTween( prop, hidden ? dataShow[ prop ] : 0 );
orig[ prop ] = dataShow[ prop ] || jQuery.style( elem, prop );

if ( !( prop in dataShow ) ) {
dataShow[ prop ] = tween.start;
if ( hidden ) {
tween.end = tween.start;
tween.start = prop === "width" || prop === "height" ? 1 : 0;
}
}
}
}
}

function Tween( elem, options, prop, end, easing ) {
return new Tween.prototype.init( elem, options, prop, end, easing );
}
jQuery.Tween = Tween;

Tween.prototype = {
constructor: Tween,
init: function( elem, options, prop, end, easing, unit ) {
this.elem = elem;
this.prop = prop;
this.easing = easing || "swing";
this.options = options;
this.start = this.now = this.cur();
this.end = end;
this.unit = unit || ( jQuery.cssNumber[ prop ] ? "" : "px" );
},
cur: function() {
var hooks = Tween.propHooks[ this.prop ];

return hooks && hooks.get ?
hooks.get( this ) :
Tween.propHooks._default.get( this );
},
run: function( percent ) {
var eased,
hooks = Tween.propHooks[ this.prop ];

if ( this.options.duration ) {
this.pos = eased = jQuery.easing[ this.easing ](
percent, this.options.duration * percent, 0, 1, this.options.duration
);
} else {
this.pos = eased = percent;
}
this.now = ( this.end - this.start ) * eased + this.start;

if ( this.options.step ) {
this.options.step.call( this.elem, this.now, this );
}

if ( hooks && hooks.set ) {
hooks.set( this );
} else {
Tween.propHooks._default.set( this );
}
return this;
}
};

Tween.prototype.init.prototype = Tween.prototype;

Tween.propHooks = {
_default: {
get: function( tween ) {