We want to open a dynamic html page (with js scripts) in a contentpanel without reloading the main Ext scripts (ext-all.js...) again.We try to use load method with seturl: the page is loaded (view in firebug) but the only thing that appear is the loading text (define in load function). We try to load php file, html file (whitout <HEAD> and <BODY> tag) and js file but nothing is ok

Here is the js code:
Ext.onReady(function() {

var layout = new Ext.BorderLayout(document.body, {
       hideOnLayout: true,
	   north: { split: false, initialSize: 60, titlebar: false },
	   center: {titlebar: false, autoScroll: false},

layout.add('north', new Ext.ContentPanel('north', 'North'));
layout.add('center', new Ext.ContentPanel('center', {title: 'Close Me', closable: true}));


    url: "load.php",
    discardUrl: false,
    nocache: false,
    text: "Loading...",
    timeout: 30,
    scripts: true

What is wrong in this code, do you have some idea?
Thanks for replies and sorry for the bad english!