Improvements:

* [#261437] by brmassa

fusioncharts/fusioncharts.install

+<?php
+// $Id$
+/**
+ * @author Bruno Massa http://drupal.org/user/67164
+ * @file
+ * Install and unistall functions for this module
+ */
+
+/**
+ * Implementation of hook_requirements().
+ */
+function fusioncharts_requirements($phase) {
+  $path = file_create_path() .'/fusioncharts';
+  if (!file_exists($path .'/MSLine.swf')) {
+    $requirements['charts']['title']        = t('FusionCharts');
+    $requirements['charts']['value']        = t('FusionCharts flash files not installed');
+    $requirements['charts']['severity']     = REQUIREMENT_ERROR;
+    $requirements['charts']['description']  = t('Put all flash files inside %dir.', array('%dir' => $path));
+
+    return $requirements;
+  }
+}