$.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 );
    }
  });
};