diff --git a/js/books.js b/js/books.js
index c3327da..f5794f9 100644
--- a/js/books.js
+++ b/js/books.js
@@ -49,9 +49,11 @@ function redirectToLogin() {
 
 function getContents() {
    if ( searchTimeout ) clearTimeout(searchTimeout);
+   var data = {};
+   if ( $("#search").val() != "" ) data.search = $("#search").val();
    $.ajax({
       url      : 'ajax/getcontents.php',
-      data     : {search: $("#search").val()},
+      data     : data,
       dataType : 'json',
       success  : function(data, stat, jqo) {
                     if ( data.validated == false ) redirectToLogin();