function cargaajax(url, id_contenedor){
var pagina_requerida = false
if (window.XMLHttpRequest) {
	//Moz
	pagina_requerida = new XMLHttpRequest()
	} else if (window.ActiveXObject){
	//IE
	try {
	pagina_requerida = new ActiveXObject("Msxml2.XMLHTTP")
	}
	catch (e){
	try{
	pagina_requerida = new ActiveXObject("Microsoft.XMLHTTP")
	}
	catch (e){}
	}
	}
	else
	return false
	pagina_requerida.onreadystatechange=function(){
	cargarpagina(pagina_requerida, id_contenedor)
	}
	pagina_requerida.open('GET', url, true)
	pagina_requerida.send(null)
}

function cargarpagina(pagina_requerida, id_contenedor){
	if (pagina_requerida.readyState == 4 && (pagina_requerida.status==200 || window.location.href.indexOf("http")==-1))
	document.getElementById(id_contenedor).innerHTML=pagina_requerida.responseText
}