Index: /branches/version-2_13_0/data/Smarty/templates/admin/order/edit.tpl
===================================================================
--- /branches/version-2_13_0/data/Smarty/templates/admin/order/edit.tpl	(revision 23184)
+++ /branches/version-2_13_0/data/Smarty/templates/admin/order/edit.tpl	(revision 23224)
@@ -84,5 +84,6 @@
 
     $(document).ready(function() {
-        if(<!--{$arrForm.shipping_quantity.value}--> > 1){
+        var shipping_quantity = escape('<!--{$arrForm.shipping_quantity.value|h}-->');
+        if(shipping_quantity > 1){
             $("input[name^='quantity[']").attr("disabled","disabled");
         }