$('.btn').append($('<span />').addClass('helper'));

<a href="#" class="btn chart">Chart</a>

Activity Add activity Delete activity Activity warning Add Address book Delete address Search for address Add address Bookmarks Add bookmark Delete bookmark Search for bookmarks Bulb Chart Comments Add comment Add user comment Delete user comment Search for user comment Delete Edit Message Add message Delete message Favourite Folder Add folder Delete folder Info Lock Lock open Document Add document Delete document RSS Search Time Users Add user Delete user Search for user More about user Warning