How to hide subcategory menu in magento

There is two way to hide subcategory menu.One is from admin panel and other is by css.

1) From Admin Panel :-

Login to admin panel of your magento site then go to System->Configuration. from the left hand side panel click on Catalog, then click on Category Top Navigation tab.Default the value written in the Maximal Depth is 0 , make it 1 to hide the submenu.

Hide Subcategory Menu