var popup;

Ext.onReady(function() {
	popup = new Ext.Window({
		title: 'Sign Up',
		width: 235,
		bodyStyle: "background-color: #FFFFFF; padding: 5px;",
		renderTo: document.body,
		contentEl: 'sign_up_div',
		closeAction: 'hide'
	});
	
	Ext.get("sign_up_link").on("click", function() {
		popup.show(this);
		return false;
	});
});