function nuevoAjax(){
	var xmlhttp=false;
	try{
		xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
	}catch(e){
		try {
			xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
		}catch(E){
			xmlhttp = false;
		}
	}

	if (!xmlhttp && typeof XMLHttpRequest!='undefined') {
		xmlhttp = new XMLHttpRequest();
	}
	
	return xmlhttp;
}

function listarCursos(){
	
	prog = document.frminscripcion.cbprog.value;
	resul = document.getElementById('divcurso');
	ajax=nuevoAjax();	
		
	ajax.open("GET", "http://www.inictelvirtual.gob.pe/2009/libs/ajax/mostrarCursos.php?nid_prog="+prog+"&ran="+Math.random(),true);
	ajax.onreadystatechange=function() {
	if (ajax.readyState==4) {
			resul.innerHTML = ajax.responseText
		}
	}
	ajax.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	ajax.send(null)	
}