[monolithed]

<div id="btn_answer_1">
	<a href="#" id="answer_add1" style="display: block;border: 1px solid; width: 100px; height: 20px;"></a> 
</div>

<div id="btn_answer_2">
	<a href="#" id="answer_add2" style="display: block;border: 1px solid; width: 100px; height: 20px;"></a> 
</div>

window.onload = function(){
	document.getElementById('answer_add1').onclick = function(){
		alert(this.parentNode.id);
	};
	document.getElementById('answer_add2').onclick = function(){
		alert(this.parentNode.id);
	};
};