function cambiarImagen(p_ruta, p_nombreImagen, p_altImagen)
{
	//alert(p_ruta + "," + p_nombreImagen);
	//var v_rutaImagenes = "/adj/img/productos/"
	document.getElementById("imagenMuestra").src = p_ruta + p_nombreImagen;
	document.getElementById("imagenMuestra").alt = p_altImagen;
}
function isEmpty(s)
{   
	return ((s == null) || (s.length == 0));
}
function checkEmail (theField, emptyOK)
{
   if (checkEmail.arguments.length == 1) emptyOK = defaultEmptyOK;
    if ((emptyOK == true) && (isEmpty(theField))) return true;
    else if (!isEmail(theField, false)) 
	    return false;
    else return true;
}
function isEmail (s)
	{
	if (isEmpty(s)) 
	if (isEmail.arguments.length == 1) return defaultEmptyOK;
	else return (isEmail.arguments[1] == true);
	// is s whitespace?
	if (isWhitespace(s)) return false;
	var i = 1;
	var sLength = s.length;
	// look for @
	while ((i < sLength) && (s.charAt(i) != "@"))
	{
		i++;
	}
	if ((i >= sLength) || (s.charAt(i) != "@")) return false;
	else i += 2;
	// look for .
	while ((i < sLength) && (s.charAt(i) != "."))
	{
		i++;
	}
	// there must be at least one character after the .
	if ((i >= sLength - 1) || (s.charAt(i) != ".")) return false;
	else return true;
}