Index: branches/5.3.x/core/admin_templates/site_domains/site_domain_edit.tpl
===================================================================
diff -u -N -r15677 -r15902
--- branches/5.3.x/core/admin_templates/site_domains/site_domain_edit.tpl	(.../site_domain_edit.tpl)	(revision 15677)
+++ branches/5.3.x/core/admin_templates/site_domains/site_domain_edit.tpl	(.../site_domain_edit.tpl)	(revision 15902)
@@ -122,8 +122,8 @@
 	function processRedirectMode($mode) {
 		$mode = parseInt($mode);
 
-		$('#' + $field_mask.replace('#FIELD_NAME#', 'DomainIPRange')).attr('disabled', $mode > 0 ? '' : 'disabled');
-		$('#' + $field_mask.replace('#FIELD_NAME#', 'ExternalUrl')).attr('disabled', $mode == 2 ? '' : 'disabled');
+		$('#' + $field_mask.replace('#FIELD_NAME#', 'DomainIPRange')).prop('disabled', $mode <= 0);
+		$('#' + $field_mask.replace('#FIELD_NAME#', 'ExternalUrl')).prop('disabled', $mode != 2);
 	}
 </script>