dropdown menu in drupal?

how can i style primary menu as a dropdown menu is dru开发者_JAVA技巧pal?

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It would take forever to "Style" it, however there are tons of modules that allow it: Nice menus for one...

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Here's a useful link on the subject without using a module like Nice menus: http://drupal.org/node/190263

Also, make sure under site building > menus > primary links (or whatever menu you're using) you have the "expanded" option checked under the items you want to drop down.