function clean(object) {
		switch (object.value) {
			case " ":
				object.value = "";
				break;
				
			case "Nombre":
				object.value = "";
				break;
				
			case "Empresa":
				object.value = "";
				break;
				
			case "Web":
				object.value = "";
				break;
				
			case "Correo electrónico":
				object.value = "";
				break;
				
			case "Teléfono":
				object.value = "";
				break;
				
			case "Comentario":
				object.value = "";
				break;

		}
}

function comproba(object) {
	if (object.value == "") 
	{
			object.value = document.forms[0].elements[object.name+"V"].value;
	}	
}