[nikita.mmf]

<input id='test' type='button' value='Go' onclick="setOpen()" />
<script type="text/javascript">
function changeClick(){	
	alert('Changeded Click');
}
function setOpen(){
	alert ("First Click");
	var elem = document.getElementById('test');
	if (!elem) return;
	elem.removeAttribute("onclick");
	elem.onclick = changeClick;
}
</script>