Remove Category menu from top bar but not from sidebar

Hello Dear,

I am very new in magento eCommerce CMS. I am using eclipse magento theme. I have added categories in my website. but the categories are showing in top main menu and left side menu.
Now I want remove categories menu from top main menu. but not from left side menu.
Please any one here to give me a suggestion, how can I remove the category menus from top main menu? My website link is http://eclipse.mylittlecarnival.com/

Thanks
Md. Nazmul Hassan