function add_bookmark() 
{
	var browsName = navigator.appName; 
	if (browsName == "Microsoft Internet Explorer") 
	{ 
		window.external.AddFavorite('http://www.fundacionsierraminera.org','Fundación Sierra Minera');
	} 
	else 
	if (browsName == "Netscape") 
	{
		alert ("\nPara agregar Fundación Sierra Minera a tus favoritos presiona CTRL+D");
	}
}