Dynamic Menu Highlighting Problem

Hello,

I used the second method shown in Dynamic Menu Highlighting to have the navigation menu dynamically highlights the currently displayed page.

This is what I have in my header.php:

<ul id="menu">

        <!-- To show "current" for Index -->
      <li<?php
                if (is_home())
                {
                echo " id=\"current\"";
                }?>>
                <a href="<?php bloginfo('url') ?>">Everything</a>

        </li>

        <!-- To show "current" for Category -->

         <li<?php
                if (is_category('Painting') || in_category('9') && !is_single())
                {
                echo " id=\"current\"";
                }?>>
                <a href="<?php bloginfo('url') ?>/category/painting">Painting</a>
        </li>

         <li<?php
                if (is_category('Illustration') || in_category('32') && !is_single())
                {
                echo " id=\"current\"";
                }?>>
                <a href="<?php bloginfo('url') ?>/category/illustration">Illustration</a>
        </li>

           <li<?php
                if (is_category('Design') || in_category('25') && !is_single())
                {
                echo " id=\"current\"";
                }?>>
                <a href="<?php bloginfo('url') ?>/category/design">Design</a>
        </li>

                   <li<?php
                if (is_category('Photography') || in_category('55') && !is_single())
                {
                echo " id=\"current\"";
                }?>>
                <a href="<?php bloginfo('url') ?>/category/photography">Photography</a>
        </li>

                <li<?php
                if (is_category('News') || in_category('51') && !is_single())
                {
                echo " id=\"current\"";
                }?>>
                <a href="<?php bloginfo('url') ?>/category/news">About</a>
        </li>

         <!-- To show "current" for Page -->
        <li<?php
                if (is_page('Correspondance'))
                {
                echo " id=\"current\"";
                }?>>
                <a href="<?php bloginfo('url') ?>/correspondance">Correspondance</a>
        </li>
</ul>

This is what I have is my css:

#current a {
	color: #5c9eb8;
}

The result is that the navigation menu dynamically highlights the currently displayed page. All is working well except for a few issues.

When I click Everything (which is the home page), it highlights Everything & Illustration. I’m only having this issue with home. Why is this happening?

And is there a way to highlight a category when visiting a post (single page)?

Thank you!

Antonella