function llamadasin(url, contenedor,act)
{
	var pagina_requerida = false
	if (window.XMLHttpRequest) 
	{
		pagina_requerida = new XMLHttpRequest()
	}
	else if (window.ActiveXObject)
	{ 
	
		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()
	{
			pintapagina(pagina_requerida, contenedor,act)
	}
	pagina_requerida.open('GET', url, true) 
	pagina_requerida.send(null)
}

function pintapagina(pagina_requerida,contenedor,act)
{
	if (pagina_requerida.readyState == 4 && (pagina_requerida.status == 200 || window.location.href.indexOf("http") == -1)) 
		document.getElementById(contenedor).innerHTML = pagina_requerida.responseText
	else 
	{
		if(act==1)
			document.getElementById(contenedor).innerHTML = "<img src='images/loading.gif' />";
	}
}