diff --git a/modules/openlayers_ui/includes/openlayers_ui.styles.inc b/modules/openlayers_ui/includes/openlayers_ui.styles.inc
old mode 100644
new mode 100755
index 3045d74..16d4cdd
--- a/modules/openlayers_ui/includes/openlayers_ui.styles.inc
+++ b/modules/openlayers_ui/includes/openlayers_ui.styles.inc
@@ -287,7 +287,20 @@ function openlayers_ui_styles_form($form, &$form_state, $style = NULL, $edit = F
 }
 
 /**
- * Submit handler for layers.
+ * Validation handler for styles.
+ */
+function openlayers_ui_styles_form_validate($form, &$form_state) {
+  if ($form_state['values']['data']['fillOpacity'] < 0 || $form_state['values']['data']['fillOpacity'] > 1) {
+    form_set_error('fillOpacity',  t('The fillOpacity property must be between 0 and 1.'));
+  }
+  if ($form_state['values']['data']['graphicOpacity'] < 0 || $form_state['values']['data']['graphicOpacity'] > 1) {
+    form_set_error('graphicOpacity', t('The graphicOpacity property must be between 0 and 1.'));
+  }
+}
+
+
+/**
+ * Submit handler for styles.
  */
 function openlayers_ui_styles_form_submit(&$form, &$form_state) {
   $style_data = $form_state['values']['style_data'];