.hover_story_o span,.hover_story_t span{display:none;}

.hover_story_o:hover span {display:block;border:1px solid #aaaaaa;padding:10px;width:450px;background-color:#f3f3f3;}
.hover_story_t:hover span {display:block;border:1px solid #aaaaaa;padding:10px;width:450px;background-color:#f3f3f3;}