CSS Dropdown menu for the header- With Categories!

[kburner]

I am still struggling with getting drop down menu NOT to display at login, shopping cart and checkout.

I am not good with code at All. Would code go in common/tpl_main_page.php or common/tpl_header.php?

It must go something like this? (this is for hiding sideboxes)

$center_column_only = array('login','account','no_account','checkout','create_account', 'shopping_cart');
if (in_array($current_page_base,$center_column_only) ) {
$flag_disable = true;
}

Help!

I think I found area where code should go.
common\tpl_header.php

<!--bof-drop down menu display-->
<?php require($template->get_template_dir('tpl_drop_menu.php',DIR_WS_TEMPLATE, $current_page_base,'common'). '/tpl_drop_menu.php');?>
<!--eof-drop down menu display-->

I tried code above and with variations and still does not work. Does anyone know code to get drop menu NOT to show on login, shopping_cart, checkout.?