Smilie selection in drop-down box, any idea?

[charlie71]

Hey guys,
we have a problem with a JS solution for a custom addon. We need a dropdown box to select a smilie, our solution dont work and i wonder why...

This is the code:

<if condition="$show['posticons']">
	<script type="text/javascript">
	<!--
	function swap_posticon(imgid)
	{
		var out = fetch_object("display_posticon");
		var img = fetch_object(imgid);
		if (img)
		{
			out.src = img.src;
			out.alt = img.alt;
		}
		else
		{
			out.src = "$vboptions[cleargifurl]";
			out.alt = "";
		}
	}
	// -->
	</script>
	<fieldset class="fieldset" style="margin-top: $stylevar[cellpadding]px">
		<legend>$vbphrase[post_icons]</legend>
		<div style="padding:$stylevar[formspacer]px">
			<table cellpadding="0" cellspacing="$stylevar[cellspacing]" border="0" width="95%">
			<tr>
				<td colspan="15"><div style="margin-bottom:$stylevar[formspacer]px">$vbphrase[may_choose_icon_for_message]:</div></td>
			</tr>
			<tr>
				<td width="12%" nowrap="nowrap"><label for="rb_iconid_0"><input type="radio" name="iconid" value="0" id="rb_iconid_0" tabindex="1" onclick="swap_posticon(null)" $iconchecked />$vbphrase[no_icon] &nbsp; &nbsp;</label></td>
				$posticonbits
				<if condition="$show['addedspan']"><td colspan="$remainingspan">&nbsp;</td></if>
			</tr>
			</table>
		</div>
	</fieldset>
<else />
	<input type="hidden" name="iconid" value="0" />
</if>

<td><input type="radio" name="iconid" value="$iconid" id="rb_iconid_$iconid" tabindex="1" onclick="swap_posticon('pi_$iconid')" $iconchecked /></td>
<td width="12%"><label for="rb_iconid_$iconid"><img src="$iconpath" alt="$alttext" id="pi_$iconid" onclick="rb_iconid_$iconid.click()" /></label></td>

There is no Javascript error in the debugger, it simply not execute the code / updates the <img> with the selected icon.
I would really appreciate any suggestion.