diff --git a/cataloguing/value_builder/unimarc_field_105.pl b/cataloguing/value_builder/unimarc_field_105.pl
index f0ff7f2dd8..35acbc0dce 100755
--- a/cataloguing/value_builder/unimarc_field_105.pl
+++ b/cataloguing/value_builder/unimarc_field_105.pl
@@ -33,9 +33,10 @@ sub plugin_javascript {
     my ($dbh,$record,$tagslib,$field_number) = @_;
     my $res="
     <script>
-        function Clic$field_number() {
-                defaultvalue=document.getElementById(\"$field_number\").value;
-                window.open(\"../cataloguing/plugin_launcher.pl?plugin_name=unimarc_field_105.pl&index=$field_number&result=\"+defaultvalue,\"unimarc_field_105\",'width=1200,height=400,toolbar=false,scrollbars=yes');
+        function Clic$field_number(ev) {
+                ev.preventDefault();
+                defaultvalue=document.getElementById(ev.data.id).value;
+                window.open(\"../cataloguing/plugin_launcher.pl?plugin_name=unimarc_field_105.pl&index=\" + ev.data.id + \"&result=\"+defaultvalue,\"unimarc_field_105\",'width=1200,height=400,toolbar=false,scrollbars=yes');
 
         }
     </script>