login result php

if(Ext.getCmp('user').getValue() !== '' && Ext.getCmp('password').getValue() !== ''){
                form.getForm().submit({
                url: 'authenticate.php',
                method: 'POST',
                params: {
                response: hex_md5(Ext.getCmp('challenge').getValue()+hex_md5(Ext.getCmp('password').getValue()))
                },
                success: function(){
                window.location = 'yourpage.php';
                },
                failure: function(form, action){
                Ext.MessageBox.show({
                title: 'Error',
                msg: action.result.message,
                buttons: Ext.Msg.OK,
                icon: Ext.MessageBox.ERROR
                });