diff --git a/sortt.js b/sortt.js
index 3fad9fa..2b161e7 100644
--- a/sortt.js
+++ b/sortt.js
@@ -8,17 +8,15 @@
 
 */
 
-//creat global function with main routine
+//create global function with main routine
 window.sortt=function(normsort,revsort,isdefault){
   //sortTable [normsort] (revsort) (isdefault)
 
   //normsort is needet
-  if (typeof normsort  === 'undefined') return false;
+  if (normsort) return false;
 
   //default values of optinal parameters
-  if (typeof revsort  === 'undefined') revsort = "";
-  if (typeof isdefault  === 'undefined') isdefault = false;
-  if (!(typeof isdefault  === 'boolean')) isdefault = false;
+  if (revsort) revsort = "";
 
   // parse URL
   /*  script check if url has already a sort=