function async_load(objeto) {
    var node;

    try {
    	// variable _asyncDom is set from JavaScript in the iframe
        // node = top._asyncDom.cloneNode(true); // kills Safari 1.2.4
        node = top._asyncDom;
        // try to remove the first script element, the one that
        // executed all document.writes().
        node.removeChild(node.getElementsByTagName("script")[0]);
    } catch (e) { 
        // alert(e);
    }
    try {
    	// insert DOM fragment at a DIV with id "async_demo" on current page
      //document.getElementById("async_demo").appendChild(node);
	document.getElementById(objeto).innerHTML = node.innerHTML;


    } catch (e) {
        try {
        	// fallback for some non DOM compliant browsers
            document.getElementById(objeto).innerHTML = node.innerHTML;
        } catch (e1) {};
    }
}


function cambiarPaginaGrupo(menu)
  {
    window.open (menu[menu.selectedIndex].value); 
  }