Parse error: syntax error

[NancyOK]

Not sure what I'm looking for here. Does anyone else know? Thank you for your help in advance.

if ( ($category_depth == 'products') || (zen_check_url_get_terms()) ) {
// This section deals with product-listing page contents
define('HEADING_TITLE', 'Available Products');
define('TABLE_HEADING_IMAGE', 'Product Image');
define('TABLE_HEADING_MODEL', 'Model');
define('TABLE_HEADING_PRODUCTS', 'Product Name');
define('TABLE_HEADING_MANUFACTURER', 'Manufacturer');
define('TABLE_HEADING_QUANTITY', 'Quantity');
define('TABLE_HEADING_PRICE', 'Price');
define('TABLE_HEADING_WEIGHT', 'Weight');
define('TABLE_HEADING_BUY_NOW', 'Buy Now');
define('TEXT_NO_PRODUCTS', 'There are no products to list in this category.');
define('TEXT_NO_PRODUCTS2', 'There is no product available from this manufacturer.');
define('TEXT_NUMBER_OF_PRODUCTS', 'Number of Products: ');
define('TEXT_SHOW', 'Filter Results by:');
define('TEXT_BUY', 'Buy 1 \'');
define('TEXT_NOW', '\' now');
define('TEXT_ALL_CATEGORIES', 'All Categories');
define('TEXT_ALL_MANUFACTURERS', 'All Manufacturers');
} elseif ($category_depth == 'top') {
// This section deals with the "home" page at the top level with no options/products selected
/* Replace this text with the headline you would like for your shop. For example: 'Welcome to My SHOP!'*/
define('HEADING_TITLE', ');
} elseif ($category_depth == 'nested') {
// This section deals with displaying a subcategory
/* Replace this line with the headline you would like for your shop. For example: 'Welcome to My SHOP!' */
define('HEADING_TITLE', '.');
}
?>

[DrByte]

if ( ($category_depth == 'products') || (zen_check_url_get_terms()) ) {
// This section deals with product-listing page contents
define('HEADING_TITLE', 'Available Products');
define('TABLE_HEADING_IMAGE', 'Product Image');
define('TABLE_HEADING_MODEL', 'Model');
define('TABLE_HEADING_PRODUCTS', 'Product Name');
define('TABLE_HEADING_MANUFACTURER', 'Manufacturer');
define('TABLE_HEADING_QUANTITY', 'Quantity');
define('TABLE_HEADING_PRICE', 'Price');
define('TABLE_HEADING_WEIGHT', 'Weight');
define('TABLE_HEADING_BUY_NOW', 'Buy Now');
define('TEXT_NO_PRODUCTS', 'There are no products to list in this category.');
define('TEXT_NO_PRODUCTS2', 'There is no product available from this manufacturer.');
define('TEXT_NUMBER_OF_PRODUCTS', 'Number of Products: ');
define('TEXT_SHOW', 'Filter Results by:');
define('TEXT_BUY', 'Buy 1 \'');
define('TEXT_NOW', '\' now');
define('TEXT_ALL_CATEGORIES', 'All Categories');
define('TEXT_ALL_MANUFACTURERS', 'All Manufacturers');
} elseif ($category_depth == 'top') {
// This section deals with the "home" page at the top level with no options/products selected
/* Replace this text with the headline you would like for your shop. For example: 'Welcome to My SHOP!'*/
define('HEADING_TITLE', ');
} elseif ($category_depth == 'nested') {
// This section deals with displaying a subcategory
/* Replace this line with the headline you would like for your shop. For example: 'Welcome to My SHOP!' */
define('HEADING_TITLE', '.');
}

define('HEADING_TITLE', '); ... that last ' mark should be two ' marks

[NancyOK]

define('HEADING_TITLE', '); ... that last ' mark should be two ' marks

Thank you for your help.