Currently, I have a webshop using http and https. For SEO in Google I try to split the webshop into a part using http and important data transfer using https. Pages like account, login and cart must be using https to secure data.

The webshop is divided in 3 categories: webshop, customer service and repair centre. With .htaccess I control the url by rewriting them into or or

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php/$1 [QSA]
Important to know is that the index.php is controlling the rewrite instead of .htaccess:
PHP Code:
$aController array_valuesarray_diffexplode('/'$_SERVER['REQUEST_URI']), explode('/'$_SERVER['SCRIPT_NAME'])));

if (isset(
$aController[0])) {
$sQueryI "SELECT * FROM vvs_core_navigatie WHERE slug = '".mysql_real_escape_string($aController[0])."'";
    if (!
$sResultI mysql_query($sQueryI)) {
    } else {
        if (
mysql_num_rows($sResultI) == 1) {
$objI mysql_fetch_assoc($sResultI);    
            if (
$objI['ptype'] == 'p') {
$setPage 'dir_content/frontpage.php';
            } elseif (
$objI['ptype'] == 'c') {
$setPage 'dir_content/pagina.php';
        } else {
header('Location: /');

What I want is to force https for the pages:
On the place of ?? must be one of the three categories (webshop, customer service and repair centre), but this is dynamic and the pages are not fixed with a category.

The remaining pages must be forced to stay at http (no https).

What I have already tried is to modify my .htaccess:
# RewriteEngine On
# RewriteCond %{REQUEST_FILENAME} !-f
# RewriteRule ^(.*)$ index.php/$1 [QSA]

# force https for all URLs in /~/account/
RewriteCond %{HTTPS} = off
RewriteRule ^/(.*)/account/ https://%{HTTP_HOST}/$1/account/ [R=301,L]

# do not do anything for already existing files
RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule .+ - [L]

# force http for all other URLs that are not in /~/account/
RewriteCond %{HTTPS} = on
RewriteCond %{REQUEST_URI} !^/(.*)/account/
RewriteRule .* http://%{HTTP_HOST}%{REQUEST_URI} [R=301,L]

# your other rules here, e.g.:
RewriteCond %{REQUEST_FILENAME} !-f 
RewriteRule ^(.*)$ index.php/$1 [L]
The .htaccess code gives an error on the webshop.
Can someone help me with this problem, please?