/*
 * 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'))-10;
 var startOffset         = $obj.parent().offset().top-20;
 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 );
 }
 });
 };