Plz open ja_templatetools.php
Search those lines:
$html = '<link href="'.$this->templateurl().'/ja_menus/ja_cssmenu/ja-sosdmenu.css" rel="stylesheet" type="text/css" />
<script language="javascript" type="text/javascript" src="'.$this->templateurl().'/ja_menus/ja_cssmenu/ja.moomenu.js"></script>
';
Change to
$html = '<link href="'.$this->templateurl().'/ja_menus/ja_cssmenu/ja-sosdmenu.css" rel="stylesheet" type="text/css" />
<script language="javascript" type="text/javascript" src="'.$this->templateurl().'/ja_menus/ja_cssmenu/ja.moomenu.js"></script>
<script language="javascript" type="text/javascript" src="'.$this->templateurl().'/scripts/mootools.v1.1.js"></script>
';