jQuery.extend( {}, speed ) : {
complete: fn || !fn && easing ||
jQuery.isFunction( speed ) && speed,
duration: speed,
easing: fn && easing || easing && !jQuery.isFunction( easing ) && easing
};

opt.duration = jQuery.fx.off ? 0 : typeof opt.duration === "number" ? opt.duration :
opt.duration in jQuery.fx.speeds ? jQuery.fx.speeds[ opt.duration ] : jQuery.fx.speeds._default;

// normalize opt.queue - true/undefined/null -> "fx"
if ( opt.queue == null || opt.queue === true ) {
opt.queue = "fx";
}

// Queueing
opt.old = opt.complete;

opt.complete = function() {
if ( jQuery.isFunction( opt.old ) ) {
opt.old.call( this );
}

if ( opt.queue ) {
jQuery.dequeue( this, opt.queue );
}
};

return opt;
};

jQuery.easing = {
linear: function( p ) {
return p;
},
swing: function( p ) {
return 0.5 - Math.cos( p*Math.PI ) / 2;
}
};

jQuery.timers = [];
jQuery.fx = Tween.prototype.init;
jQuery.fx.tick = function() {
var timer,
timers = jQuery.timers,
i = 0;

fxNow = jQuery.now();

for ( ; i < timers.length; i++ ) {
timer = timers[ i ];
// Checks the timer has not already been removed
if ( !timer() && timers[ i ] === timer ) {
timers.splice( i--, 1 );
}
}

if ( !timers.length ) {
jQuery.fx.stop();
}
fxNow = undefined;
};

jQuery.fx.timer = function( timer ) {
if ( timer() && jQuery.timers.push( timer ) ) {
jQuery.fx.start();
}
};

jQuery.fx.interval = 13;

jQuery.fx.start = function() {
if ( !timerId ) {
timerId = setInterval( jQuery.fx.tick, jQuery.fx.interval );
}
};

jQuery.fx.stop = function() {
clearInterval( timerId );
timerId = null;
};

jQuery.fx.speeds = {
slow: 600,
fast: 200,
// Default speed
_default: 400
};

// Back Compat <1.8 extension point
jQuery.fx.step = {};

if ( jQuery.expr && jQuery.expr.filters ) {
jQuery.expr.filters.animated = function( elem ) {
return jQuery.grep(jQuery.timers, function( fn ) {
return elem === fn.elem;
}).length;
};
}
jQuery.fn.offset = function( options ) {
if ( arguments.length ) {
return options === undefined ?
this :
this.each(function( i ) {
jQuery.offset.setOffset( this, options, i );
});
}

var docElem, win,
box = { top: 0, left: 0 },
elem = this[ 0 ],
doc = elem && elem.ownerDocument;

if ( !doc ) {
return;
}

docElem = doc.documentElement;

// Make sure it's not a disconnected DOM node
if ( !jQuery.contains( docElem, elem ) ) {
return box;
}

// If we don't have gBCR, just use 0,0 rather than error
// BlackBerry 5, iOS 3 (original iPhone)
if ( typeof elem.getBoundingClientRect !== core_strundefined ) {
box = elem.getBoundingClientRect();
}
win = getWindow( doc );
return {
top: box.top + ( win.pageYOffset || docElem.scrollTop ) - ( docElem.clientTop || 0 ),
left: box.left + ( win.pageXOffset || docElem.scrollLeft ) - ( docElem.clientLeft || 0 )
};
};

jQuery.offset = {

setOffset: function( elem, options, i ) {
var position = jQuery.css( elem, "position" );

// set position first, in-case top/left are set even on static elem
if ( position === "static" ) {
elem.style.position = "relative";
}

var curElem = jQuery( elem ),
curOffset = curElem.offset(),
curCSSTop = jQuery.css( elem, "top" ),
curCSSLeft = jQuery.css( elem, "left" ),
calculatePosition = ( position === "absolute" || position === "fixed" ) && jQuery.inArray("auto", [curCSSTop, curCSSLeft]) > -1,
props = {}, curPosition = {}, curTop, curLeft;

// need to be able to calculate position if either top or left is auto and position is either absolute or fixed
if ( calculatePosition ) {
curPosition = curElem.position();
curTop = curPosition.top;
curLeft = curPosition.left;
} else {
curTop = parseFloat( curCSSTop ) || 0;
curLeft = parseFloat( curCSSLeft ) || 0;
}

if ( jQuery.isFunction( options ) ) {
options = options.call( elem, i, curOffset );
}

if ( options.top != null ) {
props.top = ( options.top - curOffset.top ) + curTop;
}
if ( options.left != null ) {
props.left = ( options.left - curOffset.left ) + curLeft;
}

if ( "using" in options ) {
options.using.call( elem, props );
} else {
curElem.css( props );
}
}
};


jQuery.fn.extend({

position: function() {
if ( !this[ 0 ] ) {
return;
}

var offsetParent, offset,
parentOffset = { top: 0, left: 0 },
elem = this[ 0 ];

// fixed elements are offset from window (parentOffset = {top:0, left: 0}, because it is it's only offset parent
if ( jQuery.css( elem, "position" ) === "fixed" ) {
// we assume that getBoundingClientRect is available when computed position is fixed
offset = elem.getBoundingClientRect();
} else {
// Get *real* offsetParent
offsetParent = this.offsetParent();

// Get correct offsets
offset = this.offset();
if ( !jQuery.nodeName( offsetParent[ 0 ], "html" ) ) {
parentOffset = offsetParent.offset();
}

// Add offsetParent borders
parentOffset.top += jQuery.css( offsetParent[ 0 ], "borderTopWidth", true );
parentOffset.left += jQuery.css( offsetParent[ 0 ], "borderLeftWidth", true );
}

// Subtract parent offsets and element margins
// note: when an element has margin: auto the offsetLeft and marginLeft
// are the same in Safari causing offset.left to incorrectly be 0
return {
top: offset.top - parentOffset.top - jQuery.css( elem, "marginTop", true ),
left: offset.left - parentOffset.left - jQuery.css( elem, "marginLeft", true)
};
},

offsetParent: function() {
return this.map(function() {
var offsetParent = this.offsetParent || document.documentElement;
while ( offsetParent && ( !jQuery.nodeName( offsetParent, "html" ) && jQuery.css( offsetParent, "position") === "static" ) ) {
offsetParent = offsetParent.offsetParent;
}
return offsetParent || document.documentElement;
});
}
});


// Create scrollLeft and scrollTop methods
jQuery.each( {scrollLeft: "pageXOffset", scrollTop: "pageYOffset"}, function( method, prop ) {
var top = /Y/.test( prop );

jQuery.fn[ method ] = function( val ) {
return jQuery.access( this, function( elem, method, val ) {
var win = getWindow( elem );