/*
			 * 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 );
					}
				});
			};

//			$('#menu').stickyfloat({ duration: 400 });