<meta charset="utf-8" />
<script>
function pulaLinha() {
document.write("<br>");
}
function mostra(frase) {
document.write(frase);
pulaLinha();
}
var num = 20;
while (num >= 0 ) {
mostra(num);
num = num - 1;
}
mostra ("FIM");
</script>
