function cargar(url, id_contenedor)
{
	var pagina_requerida = false
		if (window.XMLHttpRequest) 
		{// Firefox
			pagina_requerida = new XMLHttpRequest()
		} else if (window.ActiveXObject){ // Par el explorer
			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)
}

	// colocamos la informacion
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
}