function changeFileName() {
	var MAX_LENGTH = 20;
	var str = document.getElementById("cv").value;

	if (str.length < MAX_LENGTH) {
		document.getElementById("selected_file").innerHTML = str.toLowerCase();
	} else {
		document.getElementById("selected_file").innerHTML = "..." + str.substring(str.length-MAX_LENGTH, str.length).toLowerCase();
	}
}

function enviarForm() {
	document.getElementById("enviar").disabled = true;
	document.getElementById("frm_carreras").submit();
}