<html>
<head>
<script type=text/javascript>
function hide(){
document.getElementById('text1').style.visibility='hidden';
}
function show(){
document.getElementById('text1').style.visibility='visible';
}
</script>
</head>
<body>
<form>
<input type=text id=text1>
<input type=button value=hide onclick=hide()>
<input type=button value=show onclick=show()>
<input type=checkbox onclick=hide()>
</form>
</body>
</html>
