you want it to be able to flip back and forth infinitely?
Code:
<html>
<head>
<script type="text/javascript">
var clicked=false;
function duck(){
alert("wabbit season")
clicked=true;
}
function wabbit(){
alert("duck season")
clicked=false;
}
</script>
</head>
<body>
<input type="button" value="click me!" onclick="clicked==false?duck():wabbit()" />
</body>
</html>