<input type="button" id="show-win" value="Show Window"/>

<script type="text/javascript">

Ext.onReady(function(){

    var panelContent;
    var win;
    var button = Ext.get('show-win');
    
    button.on('click', function(){
        if (!win) {
            // content for window
            panelContent = new Ext.Panel({
                region: 'center',
                margins: '0 0 0 0',
                autoScroll: true,
                html: '<iframe style="overflow:auto;width:100%;height:100%;" frameborder="0"  src="f?p=&APP_ID .:2023:&SESSION_ID ."></iframe>'
            });
            
            win = new Ext.Window({
                title: 'Popup Window',
                closable: true,
                closeAction: 'hide',
                width: 600,
                height: 600,
                border:false,
                plain: true,
                layout: 'border',
                items: [panelContent],
                buttons: [{
                    text: 'Close',
                    handler: function(){
                        win.hide();
                    }
                }]
            });
        };
        win.show(this);
    });
});

</script>