Multiple Select auslesen

[ms88aut]

<select size='3' multiple='multiple' id="test">  
	<option value='a'>a</option>  
	<option value='b'>b</option>  
	<option value='c'>c</option>  
</select>

<script type="text/javascript">  
	var sel = document.getElementById("test");  
	var len = sel.options.length;  
	var str = "";  
	for (var i = 0; i < len; i++) {  
		if(sel.options[i].selected) {  
			str += sel.options[i].value;  
		}  
	}  
	alert(str);  
</script>