var mostrado = 0;

function mostrar() {
	document.getElementById("esconde").style.visibility = 'visible';
	mostrado = 1;
}

function sabia() {
	document.sis.know.value = '1';
	document.sis.submit();
}

function naosabia() {
	document.sis.know.value = '2';
	document.sis.submit();
}