identifying tabbar iframe

when using href type=iframes-on-demand how do I change the page the iframe loads after the initial load. where can I find the name of the iframe?

The dynamically created iframes can’t be accessed by name ( at least there is no cross browser solution ), but you can access it by next API

    var sub_win = tabbar.tabWindow(tab_id);
    sub_win.document.location.href=…