Index: /Users/devinreams/Sites/wordpress/wp-admin/js/common.dev.js
===================================================================
--- /Users/devinreams/Sites/wordpress/wp-admin/js/common.dev.js	(revision 19392)
+++ /Users/devinreams/Sites/wordpress/wp-admin/js/common.dev.js	(working copy)
@@ -191,8 +191,10 @@
 			if ( f < (b - o) )
 				o = b - f;
 
+			r = o - f; // Remainder less the height of the fold
+
 			if ( o > 1 )
-				m.css({'marginTop':'-'+o+'px'});
+				m.css({'marginTop':'-'+r+'px'});
 			else if ( m.css('marginTop') )
 				m.css({'marginTop':''});