drupal 7.x

Nice Menus is a lovely module that extends the Drupal menu system so that it allows drop down and collapsing menus.

The default recommended way for using menus is to use blocks, and Nice Menus is very easy to configure as a block. However, if you've already built your page using a Zen subtheme and the main menu system, or you categorically feel that blocks are not the way to go for your site, then you need to change the page generation code in your subtheme. This little guide mentions the steps necessary to enable Nice Menu support on your Zen subtheme on the Drupal 7 series.