Customized Vertical Menu I am little bit familiar with Drupal but have no idea how to approach this problem. I want to create a menu in the following style with straight continuous lines for each tab.

                  ----- sub1
                 |
    tab1---------|----- sub2
                 |
                  ----- sub3


How can I do it?
use the super fish module. http://www.drupal.org/project/superfish that should do what you need.