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codice:
<!doctype html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>Esempio</title>
<script type="text/javascript">
function showBlockDivs (bReverse) {

	var
		oDivList = document.getElementsByName("blockDiv"),
		bShow = document.cookie.replace(/(?:(?:^|.*;\s*)show\-block\-divs\s*\=\s*((?:[^;](?!;))*[^;]?).*)|.*/, "$1") === "true";

	if (bReverse === true) {
		bShow = !bShow;
		document.cookie = "show-block-divs=" + bShow.toString() + "; expires=Fri, 31 Dec 9999 23:59:59 GMT; path=/";
	}

	for (var nItem = 0; nItem < oDivList.length; nItem++){
		bShow ? oDivList[nItem].style.removeProperty("display") : oDivList[nItem].style.setProperty("display", "none");
	}

	document.getElementById("switch-btn").value = bShow ? "Ignora" : "Visualizza";

	return bShow;

}

onload = showBlockDivs;
</script>
</head>
 
<body>

<input id="switch-btn" type="button" onclick="showBlockDivs(true);" />

<div name="blockDiv">Testo di esempio 1</div>

<div>Testo di esempio 2</div>

<div name="blockDiv">Testo di esempio 3</div>

</body>
</html>