$member['dateformat'] = str_replace('Y', 'yyyy', $member['dateformat']);
$aaurl = 'images/avatars/noavatar.gif'; //預設頭像路徑
$member['lookavatar'] = $member['avatar'] ? $member['avatar'] : $aaurl;
<!--{elseif $allowavatar == 2}-->
<tr>
<td class="altbg1" valign="top"><span class="bold">{lang avatar}</span></td>
<td class="altbg2">
<input type="text" name="urlavatar" size="25" value="$member[avatar]"> <input type="button" value="{lang memcp_avatar_list}" onclick="$('avatardiv').style.display = $('avatardiv').style.display == 'none' ? '' : 'none'; if($('avatardiv').innerHTML == ''){ showAvatar(1); }">
<span id="statusid"></span>
<div id="avatardiv" style="display: none; margin-top: 10px;"></div>
<br>{lang width}: <input type="text" name="avatarwidthnew" size="1" value="*">($member[avatarwidth]) {lang height}: <input type="text" name="avatarheightnew" size="1" value="*">($member[avatarheight])</td>
</tr>
<!--{elseif $allowavatar == 3}-->
<tr>
<td class="altbg1" valign="top"><span class="bold">{lang avatar}</span></td>
<td class="altbg2">
<input type="text" name="urlavatar" size="25" value="$member[avatar]"> <input type="button" value="{lang memcp_avatar_list}" onclick="$('avatardiv').style.display = $('avatardiv').style.display == 'none' ? '' : 'none'; if($('avatardiv').innerHTML == ''){ showAvatar(1); }">
<span id="statusid"></span>
<div id="avatardiv" style="display: none; margin-top: 10px;"></div>
<br><input type="file" name="customavatar" size="25">
<br>{lang width}: <input type="text" name="avatarwidthnew" size="1" value="*">($member[avatarwidth]) {lang height}: <input type="text" name="avatarheightnew" size="1" value="*">($member[avatarheight])</td>
</tr>
<!--{elseif $allowavatar == 2}-->
<tr>
<td class="altbg1" valign="top"><span class="bold">{lang avatar}</span><center><img id="showpic" src="$member['lookavatar']" border="0" align="absmiddle" OnError="src='$aaurl'"></center></td>
<td class="altbg2"><input type="button" value="{lang memcp_avatar_list}" onclick="$('avatardiv').style.display = $('avatardiv').style.display == 'none' ? '' : 'none'; if($('avatardiv').innerHTML == ''){ showAvatar(1); }">
<span id="statusid"></span>
<div id="avatardiv" style="display: none; margin-top: 10px;"></div>
<br><input type="text" name="urlavatar" size="25" value="$member[avatar]">
<input type="button" name="preview" value="預覽" onClick="form.urlavatar.value?showpic.src=form.urlavatar.value:alert('請輸入圖片網址');">
<br>{lang width}: <input type="text" name="avatarwidthnew" size="1" value="*"> ($member[avatarwidth]) {lang height}: <input type="text" name="avatarheightnew" size="1" value="*">($member[avatarheight])</td>
</tr>
<!--{elseif $allowavatar == 3}-->
<tr>
<td class="altbg1" valign="top"><span class="bold">{lang avatar}</span><center><img id="showpic" src="$member['lookavatar']" border="0" align="absmiddle" OnError="src='$aaurl'"></center></td>
<td class="altbg2"><input type="button" value="{lang memcp_avatar_list}" onclick="$('avatardiv').style.display = $('avatardiv').style.display == 'none' ? '' : 'none'; if($('avatardiv').innerHTML == ''){ showAvatar(1); }">
<span id="statusid"></span>
<div id="avatardiv" style="display: none; margin-top: 10px;"></div>
<br><input type="file" name="customavatar" size="25">
<br><input type="text" name="urlavatar" size="25" value="$member[avatar]">
<input type="button" name="preview" value="預覽" onClick="form.urlavatar.value?showpic.src=form.urlavatar.value:alert('請輸入圖片網址');">
<br>{lang width}: <input type="text" name="avatarwidthnew" size="1" value="*"> ($member[avatarwidth]) {lang height}: <input type="text" name="avatarheightnew" size="1" value="*">($member[avatarheight])</td>
</tr>