// JavaScript Document
$(function(){
  //当鼠标滑入时将div的class换成divOver
  $('.sub_tree_mid0').mouseover(function(){
    $(this).addClass('sub_tree_mid_hover2');  
   }
  );
  $('.sub_tree_mid').mouseover(function(){
    $(this).addClass('sub_tree_mid_hover2');  
   }
  );
  /*    +++++++++++++++++=   */
  $('.sub_tree_mid0').mouseout(function(){
    $(this).removeClass('sub_tree_mid_hover2');  
   }
  );
  $('.sub_tree_mid').mouseout(function(){
    $(this).removeClass('sub_tree_mid_hover2');  
   }
  );
 });