<script type="text/javascript">
var div = document.getElementById('pun-main').getElementsByTagName('div');
var text = 'Скрыто';
var i = 0;
while (div[i]){
if (div[i].className=='quote-box' && div[i].childNodes[0].innerHTML.indexOf('Скрытый текст')!=-1){
div[i].childNodes[0].innerHTML = text;
}
i++;
}
</script>