The first step: We in the computer login 12306 official website, then we enter into the interface to find their own train, then we open into the "booking interface" as shown in the following figure.
The second step: the mouse on the hard sleeper (or soft sleeper), and then we right button, in the pop-up menu we click on the "review element" details below (this use of Google browser):
Step three: Position the mouse to the code selected above:
<select name= "Passenger_1_seat_detail_select" style= "Display:none" id= "Passenger_1_seat_detail_select" onchange = "Setseatdetail (' 1 ')" >
Then click on the inverted triangle below, there will be shown on the bottom of the map shown in the following:
Step Fourth: Then we right-click and click Edit as HTML as shown below
The fifth step: Now we just change the display after the none to block, you will find in the page there will be upper or lower berth choice.