diff --git a/BookDetail_jsp.java b/BookDetail_jsp.java
index 4ab01fd..f036f5d 100644
--- a/BookDetail_jsp.java
+++ b/BookDetail_jsp.java
@@ -169,6 +169,12 @@ String getParam(javax.servlet.http.HttpServletRequest req, String paramName) {
     return param;
   }
 
+    String getParam(javax.servlet.http.HttpServletRequest req, String paramName) {
+    String param = req.getParameter(paramName);
+    if ( param == null || param.equals("") ) return "";
+    return param;
+  }
+
   boolean isNumber (String param) {
     boolean result;
     if ( param == null || param.equals("")) return true;