I am new to this too but I got a similar issue but found out that if you change the Page properties of the header.php and change the document type to XHTML 1.0 Transitional the codes work. Mine was in HTML5 document type. As for your issue also just try changing the ‘blog’ to ‘suits_blog’ in your code.
< li id="home"><a href="<?php echo siteRoot('suits_blog'); ?>index.html"><h1>Custom Suits Dallas</h1></a></li>
Hope that helps.
Thanks
