Put any skill id/animation you wish and voila.
else if (currentCommand.startsWith("heal"))
{
player.setCurrentHpMp(player.getMaxHp(), player.getMaxMp());
player.setCurrentCp(player.getMaxCp());
MagicSkillUse msu = new MagicSkillUse(this, player, skill_id, 1, 500, 0);
player.broadcastPacket(msu);
final NpcHtmlMessage html = new NpcHtmlMessage(0);
html.setFile(getHtmlPath(getNpcId(), 0));
html.replace("%objectId%", getObjectId());
player.sendPacket(html);
}