diff --git a/tools/website/drupal/mse-drupal-modules/highlight.inc b/tools/website/drupal/mse-drupal-modules/highlight.inc
index effacf46..495d43da 100644
--- a/tools/website/drupal/mse-drupal-modules/highlight.inc
+++ b/tools/website/drupal/mse-drupal-modules/highlight.inc
@@ -130,7 +130,7 @@ function highlight_script($code) {
 	while(strlen($code)) {
 		if (preg_match("@^<[^>]+>@",$code, $matches)) {
 			$ret .= $matches[0]; // plain tag
-		} else if (preg_match("@^(if|then|else|for( each)?|in(?= )|do|mod|and|or|xor|not|rgb|from|to)\b(?!:)@",$code, $matches)) {
+		} else if (preg_match("@^(if|then|else|for( each)?|in(?= )|do|mod|and|or|xor|not|rgb|rgba|from|to)\b(?!:)@",$code, $matches)) {
 			$ret .= "<span class='hl-kw'>" . $matches[0] . "</span>";
 		} else if (preg_match("@^(include file:)(.*)@",$code, $matches)) {
 			$ret .= "<span class='hl-key'>" . $matches[1] . "</span>" . $matches[2];