jquery.dimensions.js

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	 *                            chain will not be broken and the result will be assigned to this object.
	 * @type Object
	 * @cat Plugins/Dimensions
	 */
	position: function(returnObject) {
		return this.offset({ margin: false, scroll: false, relativeTo: this.offsetParent() }, returnObject);
	},
	
	/**
	 * Gets the location of the element in pixels from the top left corner of the viewport.
	 * The offset method takes an optional map of key value pairs to configure the way
	 * the offset is calculated. Here are the different options.
	 *
	 * (Boolean) margin - Should the margin of the element be included in the calculations? True by default.
	 * (Boolean) border - Should the border of the element be included in the calculations? False by default. 
	 * (Boolean) padding - Should the padding of the element be included in the calculations? False by default. 
	 * (Boolean) scroll - Should the scroll offsets of the parent elements be included in the calculations? True by default.
	 *                    When true it adds the total scroll offsets of all parents to the total offset and also adds two
	 *                    properties to the returned object, scrollTop and scrollLeft.
	 * (Boolean) lite - When true it will use the offsetLite method instead of the full-blown, slower offset method. False by default.
	 *                  Only use this when margins, borders and padding calculations don't matter.
	 * (HTML Element) relativeTo - This should be a parent of the element and should have position (like absolute or relative).
	 *                             It will retreive the offset relative to this parent element. By default it is the body element.
	 *
	 * Also an object can be passed as the second paramater to
	 * catch the value of the return and continue the chain.
	 *
	 * For accurate calculations make sure to use pixel values for margins, borders and padding.
	 * 
	 * Known issues:
	 *  - Issue: A div positioned relative or static without any content before it and its parent will report an offsetTop of 0 in Safari
	 *    Workaround: Place content before the relative div ... and set height and width to 0 and overflow to hidden
	 *
	 * @example $("#testdiv").offset()
	 * @result { top: 100, left: 100, scrollTop: 10, scrollLeft: 10 }
	 *
	 * @example $("#testdiv").offset({ scroll: false })
	 * @result { top: 90, left: 90 }
	 *
	 * @example var offset = {}
	 * $("#testdiv").offset({ scroll: false }, offset)
	 * @result offset = { top: 90, left: 90 }
	 *
	 * @name offset
	 * @param Map options Optional settings to configure the way the offset is calculated.
	 * @param Object returnObject An object to store the return value in, so as not to break the chain. If passed in the
	 *                            chain will not be broken and the result will be assigned to this object.
	 * @type Object
	 * @cat Plugins/Dimensions
	 */
	offset: function(options, returnObject) {
		if (!this[0]) error();
		var x = 0, y = 0, sl = 0, st = 0,
		    elem = this[0], parent = this[0], op, parPos, elemPos = $.css(elem, 'position'),
		    mo = $.browser.mozilla, ie = $.browser.msie, oa = $.browser.opera,
		    sf = $.browser.safari, sf3 = $.browser.safari && parseInt($.browser.version) > 520,
		    absparent = false, relparent = false, 
		    options = $.extend({ margin: true, border: false, padding: false, scroll: true, lite: false, relativeTo: document.body }, options || {});
		
		// Use offsetLite if lite option is true
		if (options.lite) return this.offsetLite(options, returnObject);
		// Get the HTMLElement if relativeTo is a jquery collection
		if (options.relativeTo.jquery) options.relativeTo = options.relativeTo[0];
		
		if (elem.tagName == 'BODY') {
			// Safari 2 is the only one to get offsetLeft and offsetTop properties of the body "correct"
			// Except they all mess up when the body is positioned absolute or relative
			x = elem.offsetLeft;
			y = elem.offsetTop;
			// Mozilla ignores margin and subtracts border from body element
			if (mo) {
				x += num(elem, 'marginLeft') + (num(elem, 'borderLeftWidth')*2);
				y += num(elem, 'marginTop')  + (num(elem, 'borderTopWidth') *2);
			} else
			// Opera ignores margin
			if (oa) {
				x += num(elem, 'marginLeft');
				y += num(elem, 'marginTop');
			} else
			// IE does not add the border in Standards Mode
			if ((ie && jQuery.boxModel)) {
				x += num(elem, 'borderLeftWidth');
				y += num(elem, 'borderTopWidth');
			} else
			// Safari 3 doesn't not include border or margin
			if (sf3) {
				x += num(elem, 'marginLeft') + num(elem, 'borderLeftWidth');
				y += num(elem, 'marginTop')  + num(elem, 'borderTopWidth');
			}
		} else {
			do {
				parPos = $.css(parent, 'position');
			
				x += parent.offsetLeft;
				y += parent.offsetTop;

				// Mozilla and IE do not add the border
				// Mozilla adds the border for table cells
				if ((mo && !parent.tagName.match(/^t[d|h]$/i)) || ie || sf3) {
					// add borders to offset
					x += num(parent, 'borderLeftWidth');
					y += num(parent, 'borderTopWidth');

					// Mozilla does not include the border on body if an element isn't positioned absolute and is without an absolute parent
					if (mo && parPos == 'absolute') absparent = true;
					// IE does not include the border on the body if an element is position static and without an absolute or relative parent
					if (ie && parPos == 'relative') relparent = true;
				}

				op = parent.offsetParent || document.body;
				if (options.scroll || mo) {
					do {
						if (options.scroll) {
							// get scroll offsets
							sl += parent.scrollLeft;
							st += parent.scrollTop;
						}
						
						// Opera sometimes incorrectly reports scroll offset for elements with display set to table-row or inline
						if (oa && ($.css(parent, 'display') || '').match(/table-row|inline/)) {
							sl = sl - ((parent.scrollLeft == parent.offsetLeft) ? parent.scrollLeft : 0);
							st = st - ((parent.scrollTop == parent.offsetTop) ? parent.scrollTop : 0);
						}
				
						// Mozilla does not add the border for a parent that has overflow set to anything but visible
						if (mo && parent != elem && $.css(parent, 'overflow') != 'visible') {
							x += num(parent, 'borderLeftWidth');
							y += num(parent, 'borderTopWidth');
						}
				
						parent = parent.parentNode;
					} while (parent != op);
				}
				parent = op;
				
				// exit the loop if we are at the relativeTo option but not if it is the body or html tag
				if (parent == options.relativeTo && !(parent.tagName == 'BODY' || parent.tagName == 'HTML'))  {
					// Mozilla does not add the border for a parent that has overflow set to anything but visible
					if (mo && parent != elem && $.css(parent, 'overflow') != 'visible') {
						x += num(parent, 'borderLeftWidth');
						y += num(parent, 'borderTopWidth');
					}
					// Safari 2 and opera includes border on positioned parents
					if ( ((sf && !sf3) || oa) && parPos != 'static' ) {
						x -= num(op, 'borderLeftWidth');
						y -= num(op, 'borderTopWidth');
					}
					break;
				}
				if (parent.tagName == 'BODY' || parent.tagName == 'HTML') {
					// Safari 2 and IE Standards Mode doesn't add the body margin for elments positioned with static or relative
					if (((sf && !sf3) || (ie && $.boxModel)) && elemPos != 'absolute' && elemPos != 'fixed') {
						x += num(parent, 'marginLeft');
						y += num(parent, 'marginTop');
					}
					// Safari 3 does not include the border on body
					// Mozilla does not include the border on body if an element isn't positioned absolute and is without an absolute parent
					// IE does not include the border on the body if an element is positioned static and without an absolute or relative parent
					if ( sf3 || (mo && !absparent && elemPos != 'fixed') || 
					     (ie && elemPos == 'static' && !relparent) ) {
						x += num(parent, 'borderLeftWidth');
						y += num(parent, 'borderTopWidth');
					}
					break; // Exit the loop
				}
			} while (parent);
		}

		var returnValue = handleOffsetReturn(elem, options, x, y, sl, st);

		if (returnObject) { $.extend(returnObject, returnValue); return this; }
		else              { return returnValue; }
	},
	
	/**
	 * Gets the location of the element in pixels from the top left corner of the viewport.
	 * This method is much faster than offset but not as accurate when borders and margins are
	 * on the element and/or its parents. This method can be invoked
	 * by setting the lite option to true in the offset method.
	 * The offsetLite method takes an optional map of key value pairs to configure the way
	 * the offset is calculated. Here are the different options.
	 *
	 * (Boolean) margin - Should the margin of the element be included in the calculations? True by default.
	 * (Boolean) border - Should the border of the element be included in the calculations? False by default. 
	 * (Boolean) padding - Should the padding of the element be included in the calcuations? False by default. 
	 * (Boolean) scroll - Sould the scroll offsets of the parent elements be included int he calculations? True by default.
	 *                    When true it adds the total scroll offsets of all parents to the total offset and also adds two
	 *                    properties to the returned object, scrollTop and scrollLeft.
	 * (HTML Element) relativeTo - This should be a parent of the element and should have position (like absolute or relative).
	 *                             It will retreive the offset relative to this parent element. By default it is the body element.
	 *
	 * @name offsetLite
	 * @param Map options Optional settings to configure the way the offset is calculated.
	 * @param Object returnObject An object to store the return value in, so as not to break the chain. If passed in the
	 *                            chain will not be broken and the result will be assigned to this object.
	 * @type Object
	 * @cat Plugins/Dimensions
	 */
	offsetLite: function(options, returnObject) {
		if (!this[0]) error();
		var x = 0, y = 0, sl = 0, st = 0, parent = this[0], offsetParent, 
		    options = $.extend({ margin: true, border: false, padding: false, scroll: true, relativeTo: document.body }, options || {});
				
		// Get the HTMLElement if relativeTo is a jquery collection
		if (options.relativeTo.jquery) options.relativeTo = options.relativeTo[0];
		
		do {
			x += parent.offsetLeft;
			y += parent.offsetTop;

			offsetParent = parent.offsetParent || document.body;
			if (options.scroll) {
				// get scroll offsets
				do {
					sl += parent.scrollLeft;
					st += parent.scrollTop;
					parent = parent.parentNode;
				} while(parent != offsetParent);
			}
			parent = offsetParent;
		} while (parent && parent.tagName != 'BODY' && parent.tagName != 'HTML' && parent != options.relativeTo);

		var returnValue = handleOffsetReturn(this[0], options, x, y, sl, st);

		if (returnObject) { $.extend(returnObject, returnValue); return this; }
		else              { return returnValue; }
	},
	
	/**
	 * Returns a jQuery collection with the positioned parent of 
	 * the first matched element. This is the first parent of 
	 * the element that has position (as in relative or absolute).
	 *
	 * @name offsetParent
	 * @type jQuery
	 * @cat Plugins/Dimensions
	 */
	offsetParent: function() {
		if (!this[0]) error();
		var offsetParent = this[0].offsetParent;
		while ( offsetParent && (offsetParent.tagName != 'BODY' && $.css(offsetParent, 'position') == 'static') )
			offsetParent = offsetParent.offsetParent;
		return $(offsetParent);
	}
});

/**
 * Throws an error message when no elements are in the jQuery collection
 * @private
 */
var error = function() {
	throw "Dimensions: jQuery collection is empty";
};

/**
 * Handles converting a CSS Style into an Integer.
 * @private
 */
var num = function(el, prop) {
	return parseInt($.css(el.jquery?el[0]:el,prop))||0;
};

/**
 * Handles the return value of the offset and offsetLite methods.
 * @private
 */
var handleOffsetReturn = function(elem, options, x, y, sl, st) {
	if ( !options.margin ) {
		x -= num(elem, 'marginLeft');
		y -= num(elem, 'marginTop');
	}

	// Safari and Opera do not add the border for the element
	if ( options.border && (($.browser.safari && parseInt($.browser.version) < 520) || $.browser.opera) ) {
		x += num(elem, 'borderLeftWidth');
		y += num(elem, 'borderTopWidth');
	} else if ( !options.border && !(($.browser.safari && parseInt($.browser.version) < 520) || $.browser.opera) ) {
		x -= num(elem, 'borderLeftWidth');
		y -= num(elem, 'borderTopWidth');
	}

	if ( options.padding ) {
		x += num(elem, 'paddingLeft');
		y += num(elem, 'paddingTop');
	}
	
	// do not include scroll offset on the element ... opera sometimes reports scroll offset as actual offset
	if ( options.scroll && (!$.browser.opera || elem.offsetLeft != elem.scrollLeft && elem.offsetTop != elem.scrollLeft) ) {
		sl -= elem.scrollLeft;
		st -= elem.scrollTop;
	}

	return options.scroll ? { top: y - st, left: x - sl, scrollTop:  st, scrollLeft: sl }
	                      : { top: y, left: x };
};

/**
 * Gets the width of the OS scrollbar
 * @private
 */
var scrollbarWidth = 0;
var getScrollbarWidth = function() {
	if (!scrollbarWidth) {
		var testEl = $('<div>')
				.css({
					width: 100,
					height: 100,
					overflow: 'auto',
					position: 'absolute',
					top: -1000,
					left: -1000
				})
				.appendTo('body');
		scrollbarWidth = 100 - testEl
			.append('<div>')
			.find('div')
				.css({
					width: '100%',
					height: 200
				})
				.width();
		testEl.remove();
	}
	return scrollbarWidth;
};

})(jQuery);