Something like this?
Code:
<script type="text/javascript"><!--
function addToList() {
if (document.getElementById) {
var selectElement = document.getElementById('char_list');
document.getElementById('output').value +=
selectElement.options[selectElement.selectedIndex].value;
}
}
//--></script>
<form action="..."><p>
<select size="10" id="char_list" onchange="addToList();">
<option value="abc">abc</option>
<option value="def">def</option>
<option value="ghi">ghi</option>
<option value="jkl">jkl</option>
<option value="mno">mno</option>
</select>
<textarea id="output"></textarea>
</p></form>
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