Prevent on front pages

Add a new selection box,"prevent back top top displayed on front pages."

Index: back_to_top.admin.inc
===================================================================
--- back_to_top.admin.inc	(revision 4189)
+++ back_to_top.admin.inc	(working copy)
@@ -25,6 +25,12 @@
     '#description' => t('Do you want to prevent Back To Top on admin pages?'),
     '#default_value' => variable_get('back_to_top_prevent_in_admin', TRUE),
   );
+  $form['back_to_top_prevent_in_front'] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Prevent on front pages'),
+    '#description' => t('Do you want to prevent Back To Top on front pages?'),
+    '#default_value' => variable_get('back_to_top_prevent_in_front', TRUE),
+  );
   $form['back_to_top_button_trigger'] = array(
     '#type' => 'textfield',
     '#title' => t('Trigger'),
Index: back_to_top.module
===================================================================
--- back_to_top.module	(revision 4189)
+++ back_to_top.module	(working copy)
@@ -41,6 +41,9 @@
   if (variable_get('back_to_top_prevent_in_admin', 'TRUE') && (is_adminpage())) {
     return FALSE;
   }
+  if (variable_get('back_to_top_prevent_in_front', 'TRUE') && (!is_adminpage())) {
+    return FALSE;
+  }
   drupal_add_library('system', 'effects');
   drupal_add_js(drupal_get_path('module', 'back_to_top') . '/js/back_to_top.js', array('group' => JS_DEFAULT, 'every_page' => TRUE));