Open folder: wp-content/themes/YourThemeName/header.php and add this code to the bottom:
{CODE type:php;}
<?php if(is_page(‘Services’)) :?>
<img src=”<?php bloginfo(‘template_url’); ?>/images/services.png” alt=”Services”/>
<?php endif;?>
<?php if(is_page(‘Portfolio’)) :?>
<img src=”<?php bloginfo(‘template_url’); ?>/images/portfolio.png” alt=”Portfolio”/>
<?php endif;?>
<?php if(is_page(‘Contact’)) :?>
<img src=”<?php bloginfo(‘template_url’); ?>/images/contact.png” alt=”Contact”/>
<?php endif;?>
<?php if(is_page(‘Blog’)) :?>
<img src=”<?php bloginfo(‘template_url’); ?>/images/blog.png” alt=”Blog”/>
<?php endif;?>
{/CODE}
What we have in this code: is_page(‘Services’) where Service is the name of Service page, you can use ID’s of your pages: is_page(’43’).
bloginfo(‘template_url’) this is path to Your theme, WordPress adding this automatically.
Thanks, Vlad.