You can add these js code snippet inside the “script.js” file located inside the “js/” folder of the theme (add this just after line 2 or 3):

$('nav#access').find('.menu')
    .children('.menu-item').children('.sub-menu').prev('a').append('<span />');

And add the CSS for the arrow by including this line of code inside the “Custom CSS ” textarea under the “General Settings” tab of the “Morphis Theme Options” panel:

.nav-arrow {
background: url('http://eng.sejonghakdang.org/images/com/icon/icon_down_text_arrow.gif');
width: 11px;
height: 10px;
margin: 2px 2px 0 4px;
display: inline-block;
}