/*

			 * stickyfloat - jQuery plugin for verticaly floating anything in a constrained area
			 * 
			 * Example: jQuery('#menu').stickyfloat({duration: 400});
			 * parameters:
			 * 		duration 	- the duration of the animation
			 *		startOffset - the amount of scroll offset after it the animations kicks in
			 *		offsetY		- the offset from the top when the object is animated
			 *		lockBottom	- 'true' by default, set to false if you don't want your floating box to stop at parent's bottom
			 * $Version: 05.16.2009 r1
			 * Copyright (c) 2009 Yair Even-Or
			 * vsync.design@gmail.com
			 */

$.fn.stickyfloat = function (options, lockBottom) {

    var $obj = this;
    var parentPaddingTop = parseInt($obj.parent().css('padding-top'));
    var startOffset = $obj.parent().offset().top;

    var opts = $.extend({
        startOffset: startOffset,
        offsetY: parentPaddingTop,
        duration: 200,
        lockBottom: true
    }, options);

    $obj.css({
        position: 'absolute'
    });

    if (opts.lockBottom) {

        var bottomPos = $obj.parent().height() - $obj.height() + parentPaddingTop; //get the maximum scrollTop value
        if (bottomPos < 0)

        bottomPos = 0;

    }

    $(window).scroll(function () {

        $obj.stop(); // stop all calculations on scroll event

        var pastStartOffset = $(document).scrollTop() > opts.startOffset; // check if the window was scrolled down more than the start offset declared.
        var objFartherThanTopPos = $obj.offset().top > startOffset; // check if the object is at it's top position (starting point)
        var objBiggerThanWindow = $obj.outerHeight() < $(window).height(); // if the window size is smaller than the Obj size, then do not animate.

        // if window scrolled down more than startOffset OR obj position is greater than
        // the top position possible (+ offsetY) AND window size must be bigger than Obj size
        if ((pastStartOffset || objFartherThanTopPos) && objBiggerThanWindow) {

            var newpos = ($(document).scrollTop() - startOffset + opts.offsetY);
            if (newpos > bottomPos)
            newpos = bottomPos;
            if ($(document).scrollTop() < opts.startOffset) // if window scrolled < starting offset, then reset Obj position (opts.offsetY);
            newpos = parentPaddingTop;

            $obj.animate({
                top: newpos
            }, opts.duration);
        }
    });
};