make evaluateDataChecks a function, not a method in Location. make so can in main-nav

diff --git a/js/game.js b/js/game.js
index c9f57ca..ef37921 100644
--- a/js/game.js
+++ b/js/game.js
@@ -489,6 +489,47 @@ function interpolateVariables(text)
     }
     return text;
 }
+/**
+ * A data-ck attribute on any tag other than an x-present tag can
+ * contain a Javascript boolean expression to control the display
+ * or non-display of that element. This is similar to a ck attribute
+ * of an x-present tag. This method evalutes data-ck expressions for
+ * each tag in the text in its section argument and adds a class="none"
+ * attribute to that tag if it evaluates to false (causing it not to
+ * display). The string after these substitutions is returned.
+ *
+ * @param {string} section of text to check for data-ck attributes and
+ *  for which to carry out the above described substitutions
+ * @return {string} after substitutions have been carried out.
+ */
+function evaluateDataChecks(section)
+{
+    let quote = `(?:(?:'([^']*)')|(?:"([^"]*)"))`;
+    let old_section = "";
+    while (section != old_section) {
+        old_section = section;
+        let data_ck_pattern = new RegExp(
+            "\<(?:[^\>]+)(data\-ck\s*\=\s*(" + quote + "))(?:[^\>]*)\>",
+        'i');
+        let data_ck_match = section.match(data_ck_pattern);
+        if (!data_ck_match) {
+            continue;
+        }
+        let condition = (typeof data_ck_match[3] == 'string') ?
+             data_ck_match[3] : data_ck_match[4];
+        if (typeof condition == 'string') {
+            let check_result = (condition.replace(/\s+/, "") != "") ?
+                eval(condition) : true;
+            if (check_result) {
+                section = section.replace(data_ck_match[1], " ");
+            } else {
+                section = section.replace(data_ck_match[1],
+                    " class='none' ");
+            }
+        }
+    }
+    return section;
+}
 /**
  * Returns the game object with the provided id.
  * @param {string} object_id to get game object for
@@ -651,6 +692,7 @@ class Location
                     content.originalHTML = content.innerHTML;
                 }
                 content.innerHTML = interpolateVariables(content.originalHTML);
+                content.innerHTML = evaluateDataChecks(content.innerHTML);
                 game.initializeGameNavListeners();
             }
             let control_types = ["input", "textarea", "select"];
@@ -772,47 +814,6 @@ class Location
         }
         return [check_result, proceed, pause];
     }
-    /**
-     * A data-ck attribute on any tag other than an x-present tag can
-     * contain a Javascript boolean expression to control the display
-     * or non-display of that element. This is similar to a ck attribute
-     * of an x-present tag. This method evalutes data-ck expressions for
-     * each tag in the text in its section argument and adds a class="none"
-     * attribute to that tag if it evaluates to false (causing it not to
-     * display). The string after these substitutions is returned.
-     *
-     * @param {string} section of text to check for data-ck attributes and
-     *  for which to carry out the above described substitutions
-     * @return {string} after substitutions have been carried out.
-     */
-    evaluateDataChecks(section)
-    {
-        let quote = `(?:(?:'([^']*)')|(?:"([^"]*)"))`;
-        let old_section = "";
-        while (section != old_section) {
-            old_section = section;
-            let data_ck_pattern = new RegExp(
-                "\<(?:[^\>]+)(data\-ck\s*\=\s*(" + quote + "))(?:[^\>]*)\>",
-            'i');
-            let data_ck_match = section.match(data_ck_pattern);
-            if (!data_ck_match) {
-                continue;
-            }
-            let condition = (typeof data_ck_match[3] == 'string') ?
-                 data_ck_match[3] : data_ck_match[4];
-            if (typeof condition == 'string') {
-                let check_result = (condition.replace(/\s+/, "") != "") ?
-                    eval(condition) : true;
-                if (check_result) {
-                    section = section.replace(data_ck_match[1], " ");
-                } else {
-                    section = section.replace(data_ck_match[1],
-                        " class='none' ");
-                }
-            }
-        }
-        return section;
-    }
     /**
      * A given Location contains one or more x-present tags which are
      * used when rendering that location to the game-content area. This
@@ -828,7 +829,7 @@ class Location
     {
         let old_section = "";
         let quote = `(?:(?:'([^']*)')|(?:"([^"]*)"))`;
-        section = this.evaluateDataChecks(section);
+        section = evaluateDataChecks(section);
         section = interpolateVariables(section);
         while (section != old_section) {
             old_section = section;