How to use & show in your FrontEnd:

#Put bellow code to any position you want in your layout:

#Option 1: 
<block type="jmmegamenu/jmmegamenu" name="left.jmmegamenu1" before="-">
	<action method="addData"><data><menu_group_id>12</menu_group_id></data></action>
	<action method="addData"><data><addition_class>vertical-mega-menu</addition_class></data></action>
</block>

#Option 2:
<block type="jmmegamenu/jmmegamenu" name="left.jmmegamenu2" before="-">
	<action method="addData"><data><menu_key>YOUR_MENU_KEY</menu_key></data></action>
	<action method="addData"><data><addition_class>CSS_CLASS_NAME</addition_class></data></action>
</block>

#Option 3: Call in CMS page
{{block type="jmmegamenu/jmmegamenu" name="left.jmmegamenu2" menu_group_id="13"}}

#Option 4: Call in CMS page
#Use vertical style in default of Jm Megamenu, we can use bellow code:
{{block type="jmmegamenu/jmmegamenu" name="left.jmmegamenu2" menu_group_id="13" addition_class="vertical-mega-menu" }}

#Optional params:
menu_group_id
menu_key
addition_class
animation (value optionals: none, jaws, fence, venitian, fly, papercut, fan, wave, helix, pop, linear, bounce, winding, shield)