WordPress Menu highlight with pagination

I have a WordPress website with a menu similar to this one: Yahoo news, so basically:

• a horizontal menu with two levels, the first with main categories the second with sub-categories (in the "Home" menu item, the subcategory is the page "about us".
• I am using the build-in Menu of WordPress

The problem I have is with the pagination and also with the search form:

1. When I am in the Home Page and I click any pagination number, the subcategories of "Home" menu item disappears, and most importantly, the "H开发者_运维技巧ome" menu item is no longer highlighted.

2. When I search something, again the same issue, the "Home" is no longer highlighted, and there is no subcategory under "Home" menu item.

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I have found a solution:

1) Open header.php, and add this in the body tag:

<body<?php if ( is_home() || is_search() || is_404() )  { echo ' class="main"';} else { echo '';} ?>>

2) Add a class that target the home class, so:

body.main #main-menu ul li.menu-item-home a { 
    background: #313B47;
    color: white;
}

Now if I am in the home page, or in the search page, or 404 error page, WordPress adds class="main" to the body, so I can easily target the menu item which I want.