Index: yahoo_weather_forecast.module
===================================================================
--- yahoo_weather_forecast.module	(revision 47)
+++ yahoo_weather_forecast.module	(working copy)
@@ -241,6 +241,8 @@
 
     $src = drupal_get_path('module', 'yahoo_weather_forecast') .'/images/'. $prefix . $img['file'];
     $vars['current_image'] = theme('image', $src, '', $img['title'], $img['title']);
+    $custom_src = drupal_get_path('module', 'yahoo_weather_forecast') . '/myimages/' . $weather_info['condition']['code'] . ".png";
+    $vars['custom_image']  = theme('image', $custom_src, '', $img['title'], $img['title']);
   }
 
   if ($show_options['temperature']) {