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<html>
<head>
<script language="JavaScript"> var choice = "A"
function optionA() {
alert('optionA' );
}
function optionB() {
alert('optionB' );
}
</script>
</head>
<body>
<form name="form1">
<input type="button" name="button1" onClick="optionA()">
</form>
<script language="JavaScript">
if (choice != "A") {
document.form1.button1.onclick=optionB
}
</script>
</body>
</html>
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