diff --git a/koha-tmpl/intranet-tmpl/prog/en/js/cataloging.js b/koha-tmpl/intranet-tmpl/prog/en/js/cataloging.js
index 5712ab0ea5..c23637f43b 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/js/cataloging.js
+++ b/koha-tmpl/intranet-tmpl/prog/en/js/cataloging.js
@@ -40,17 +40,18 @@ function openAuth(tagsubfieldid,authtype,source) {
     var tagsubfield=getTagInputnameFilter(tagsubfieldid);
     var elementsubfcode=getSubfieldCode(element.name);
     var mainmainstring=element.value;
-    var mainstring="";
+    var mainstring = new Array();
     var inputs = element.parentNode.parentNode.getElementsByTagName("input");
 
     for (var myindex =0; myindex<inputs.length;myindex++){
         if (inputs[myindex].name && inputs[myindex].name.match(tagsubfield)){
             var subfieldcode=getSubfieldCode(inputs[myindex].name);
             if (isNaN(parseInt(subfieldcode)) && inputs[myindex].value != "" && subfieldcode!=elementsubfcode){
-                mainstring=inputs[myindex].value+" "+mainstring;
+                mainstring.push(inputs[myindex].value);
             }
         }
     }
+    mainstring = mainstring.join(' ');
     newin=window.open("../authorities/auth_finder.pl?source="+source+"&authtypecode="+authtype+"&index="+tagsubfieldid+"&value_mainstr="+encodeURI(mainmainstring)+"&value_main="+encodeURI(mainstring), "_blank",'width=700,height=550,toolbar=false,scrollbars=yes');
 }