Thanks for taking the time but my index.php has no define statements - I've attached it for you.
I can fix the prob if I change my .htaccess file to say the folling;
# Example .htaccess wich allows to parse .html as php
AddType application/x-httpd-php .html
AddType text/x-component .htc
Options +FollowSymlinks
RewriteEngine on
rewritecond %{http_host} ^merrylegsfalabellas.com [nc]
rewriterule ^(.*)$
http://www.merrylegsfalabellas.com/$1 [r=301,nc]
but then it won't let me login unless I change it back to ;
# Example .htaccess wich allows to parse .html as php
AddType application/x-httpd-php .html
AddType text/x-component .htc
HELP