Così funziona...
codice:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Prova</title>
<script language="javascript" type="text/javascript">
<!--
function vediTesto(a){
var e=document.getElementById(a);
if (!e) return true;
if(e.style.display=="none") {
e.style.display="block";
} else {
e.style.display="none";
}
return true;
}
//-->
</script>
</head>
<body>
<div onclick="vediTesto('myText');">mostra/nascondi</div>
<div id="myText">Testo</div>
</body>
</html>