var rroot = /^(?:body|html)$/i; 
jQuery.fn.offset = function (options){ 
if (arguments.length) { 
return options === undefined? this: this.each(function (i){ 
jQuery.offset.setOffset(this, options, i); 
} 
); 
} 
var box, docElem, body, win, clientTop, clientLeft, scrollTop, scrollLeft, top, left, elem = this[0], doc = elem && elem.ownerDocument; 
if (!doc) { 
return null ; 
} 
if ((body = doc.body) === elem) { 
return jQuery.offset.bodyOffset(elem); 
} 
docElem = doc.documentElement; 
if (!jQuery.contains(docElem, elem)) { 
return { 
top: 0,
left: 0}
; 
} 
box = elem.getBoundingClientRect(); 
win = getWindow(doc); 
clientTop = docElem.clientTop || body.clientTop || 0; 
clientLeft = docElem.clientLeft || body.clientLeft || 0; 
scrollTop = win.pageYOffset || docElem.scrollTop; 
scrollLeft = win.pageXOffset || docElem.scrollLeft; 
top = box.top + scrollTop - clientTop; 
left = box.left + scrollLeft - clientLeft; 
return { 
top: top,
left: left}
; 
} 
; 
jQuery.offset = { 
bodyOffset: function (body){ 
var top = body.offsetTop, left = body.offsetLeft; 
if (jQuery.support.doesNotIncludeMarginInBodyOffset) { 
top += parseFloat(jQuery.css(body, "marginTop")) || 0; 
left += parseFloat(jQuery.css(body, "marginLeft")) || 0; 
} 
return { 
top: top,
left: left}
; 
} 
,
setOffset: function (elem, options, i){ 
var position = jQuery.css(elem, "position"); 
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; 
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 null ; 
} 
var elem = this[0], offsetParent = this.offsetParent(), offset = this.offset(), parentOffset = rroot.test(offsetParent[0].nodeName)? { 
top: 0,
left: 0}
: offsetParent.offset(); 
offset.top -= parseFloat(jQuery.css(elem, "marginTop")) || 0; 
offset.left -= parseFloat(jQuery.css(elem, "marginLeft")) || 0; 
parentOffset.top += parseFloat(jQuery.css(offsetParent[0], "borderTopWidth")) || 0; 
parentOffset.left += parseFloat(jQuery.css(offsetParent[0], "borderLeftWidth")) || 0; 
return { 
top: offset.top - parentOffset.top,
left: offset.left - parentOffset.left}
; 
} 
,
offsetParent: function (){ 
return this.map(function (){ 
var offsetParent = this.offsetParent || document.body; 
while (offsetParent && (!rroot.test(offsetParent.nodeName) && jQuery.css(offsetParent, "position") === "static")){ 
offsetParent = offsetParent.offsetParent; 
} 
return offsetParent; 
} 
); 
} 
}
); 
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); 
if (val === undefined) { 
return win? (prop in win)? win[prop]: win.document.documentElement[method]: elem[method]; 
} 
if (win) { 
win.scrollTo(!top? val: jQuery(win).scrollLeft(), top? val: jQuery(win).scrollTop()); 
} 
 else { 
elem[method] = val; 
} 
} 
, method, val, _AN_Read_length("length", arguments), null ); 
} 
; 
} 
); 
function getWindow(elem){ 
return jQuery.isWindow(elem)? elem: elem.nodeType === 9? elem.defaultView || elem.parentWindow: false ; 
}