anchor.diff:      }
       href += objectType + '=' + objectId
       var a = Builder.node("a", {
  -        className: objectType + '-control control',
  +        className: objectType + '-' + controlName + '-control ' + objectType + '-control control',
           id: objectType + "-" + objectId + "-" + controlName,
           href: href
       })
  
positive.code:     var siblings = $A(thisArm.parentNode.getElementsByTagName("LI"))
  
      updateMoveControlVisibility('arm', thisArm.id.split('-')[1], thisArm, siblings)
  }
  
  function updateAllArmsControlVisibility(epochId) {
      $$('#epoch-' + epochId + '-arms li').each(updateArmControlVisibility)
  }
  
  function createStudyControls() {
  
negative.code:     } else {
          upControl.show(); downControl.show();
      }
  }
  
  function updateDeleteControlVisibility(objectType, elts) {
      var controls = $$('.' + objectType + '-delete-control')
      if (elts.length <= 1) {
          controls.each(function(c) { c.hide() })
      } else {
          controls.each(function(c) { c.show() })
      }
  }