1. Not exactly understood #1.
2. For #2, add the following to the user icon call function 'use_hover'=>false. If you want to remove the hover menu from entire site, just override the icon/user/default view with your own view in which the hover menu is removed.

headers_sent() error usually comes up when you have return prior to <?php tags

If you're using 1.8 the hover menu is controlled through plugin hooks.

elgg_register_plugin_hook_handler('register', 'menu:user_hover', 'yourtheme_hover_menu', 1000);

 

 

// called by menu:user_hover plugin hook
// $params['entity'] is the user
// $params['name'] is the menu name = "user_hover"
// $return is an array of items that are already registered to the menu
function yourtheme_hover_menu($hook, $type, $return, $params) {
  return array();
}

Ah, yes you can create the plugin_hook for the hover menu as matt mentioned. Forgot about the new navigation system in 1.8. ;)

sorry there is one mistake in #1.
It is:- i cant see the admin menu under the profile menu of each user after editing the theme.How can add it.

Thanks for ur reply.