[Resolvido] Ao invés de fixar no top, fixar no bottom

Fala galera!

Me deparei com a seguinte situação.

Preciso sempre manter uma div flutuante grudada no rodapé do navegador (não da página).

Busquei vários scripts, e nenhum me serviu. Ou não funcionavam, ou funcionavam e davam algum pepino no meu caso.

Até que encontrei este script (Site do desenvolvedor):

/*
* stickyfloat - jQuery plugin for verticaly floating anything in a constrained area
*
* Example: jQuery('#menu').stickyfloat({duration: 400});
* parameters:
* duration (200) - the duration of the animation
* startOffset (number) - the amount of scroll offset after the animations kicks in
* offsetY (number) - the offset from the top when the object is animated
* lockBottom (true) - set to false if you don't want your floating box to stop at parent's bottom
* delay (0) - delay in milliseconds until the animnations starts
easing (linear) - easing function (jQuery has by default only 'swing' & 'linear')
* $Version: 11.28.2011 r3
* $Version: 08.10.2011 r2
* $Version: 05.16.2009 r1
* Copyright (c) 2009 Yair Even-Or
* vsync.design@gmail.com
*/

(function($){
$.fn.stickyfloat = function(options, lockBottom){
	var $obj = this,
 doc = $(document),
 parentPaddingTop = parseInt($obj.parent().css('padding-top')),
 startOffset = $obj.parent().offset().top,
 opts, bottomPos, pastStartOffset, objFartherThanTopPos, objBiggerThanWindow, newpos, checkTimer, lastDocPos = doc.scrollTop();

	$.extend( $.fn.stickyfloat.opts, options, { startOffset:startOffset, offsetY:parentPaddingTop} );
	opts = $.fn.stickyfloat.opts;
	$obj.css({ position: 'absolute' });

	function checkLockBottom(){
 if(opts.lockBottom){
 bottomPos = $obj.parent().height() - $obj.outerHeight() + parentPaddingTop; //get the maximum scrollTop value
 if( bottomPos < 0 )
 bottomPos = 0;
 }
	};

	function checkScroll(){
 checkLockBottom();
 if( opts.duration > 40 ){
 clearTimeout(checkTimer);
 checkTimer = setTimeout(function(){
 if( Math.abs(doc.scrollTop() - lastDocPos) > 0 ){
 lastDocPos = doc.scrollTop();
 initFloat();
 }
 },40);
 }
 else initFloat();
	}

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

 pastStartOffset = doc.scrollTop() > opts.startOffset;	// check if the window was scrolled down more than the start offset declared.
 objFartherThanTopPos	= $obj.offset().top > startOffset;	// check if the object is at it's top position (starting point)
 objBiggerThanWindow = $obj.outerHeight() < $(window).height();	// if the window size is smaller than the Obj size, 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 ){
 newpos = (doc.scrollTop() -startOffset + opts.offsetY );

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

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

	$(window).bind('scroll.sticky',checkScroll);
};

$.fn.stickyfloat.opts = { duration:200, lockBottom:true , delay:0, easing:'linear' };
})(jQuery);

Só que ele sempre fixa no topo do navegador. gostaria de alterar para que fixasse no rodapé. Fiz diversas alterações, mas sempre dava algum problema no script e parava de funcionar.

Alguem pode me ajudar?

Abraços!