"Sticky" elements -- scrolls with the content when the window begins to hide it

sticky.js

// "Stuck" menu listing header
	var Sticky = function( $obj, opts ){

	   $(window).scroll( 
	      function(e){
	         Sticky.onScroll(e, $obj, opts );
	      });

	}
	Sticky.onScroll = function( e, $o, opts ){

	   var iScrollTop = $(window).scrollTop();
	   var sClass = "sticky";

	   //set original data
	   if( !$o.data(sClass) ){
	      $o.data(sClass, {css:{position:$o.css('position'),top:$o.css('top')}, offset:$o.offset()} );
	   }
	   var oOrig = $o.data(sClass);
	   var bIsSticky = $o.hasClass(sClass);

	   if( iScrollTop > oOrig.offset.top && !bIsSticky ){
				if( $('body').hasClass('admin-bar')) {
					$o.css({position:'fixed',top:38}).addClass(sClass);
				} else {
					$o.css({position:'fixed',top:10}).addClass(sClass);
				}

	   }else if(iScrollTop < oOrig.offset.top && bIsSticky){
	      $o.css(oOrig.css).removeClass(sClass);
	   }   

	}
	Sticky( $('#menuhead') );