//global variable for error flag
var errfound = false;

//function to validate by length
function ValidLength(item, len) {
	return (item.length >= len);
}

//function to validate an email address
function ValidEmail(item) {
	if (!ValidLength(item, 5))
		return false;
	if (item.indexOf ('@', 0) == -1)
		return false;
	return true;
}

// display an error alert
function error(elem, text) {
// abort if we already found an error
	if (errfound)
		return;
	window.alert(text);
	elem.select();
	elem.focus();
	errfound = true;
}

function abrirVentanaNueva(url, nombre, w, h) {
	popupWin = window.open(url, nombre, 'resizable=yes,scrollbars=yes,menubar=no,width=' + w +
		',height=' + h);
}