图片回显
<tr> <td width="120"> 上传头图:</td> <td > <input type="file" id="head_pic" name="head_pic" /> <{if ($activity_basic_info.head_pic)}> <img src="<{$activity_basic_info.head_pic}>" height="50px" width="50px">
<input type="hidden" id="hidden_head_pic" name="hidden_head_pic" value="<{$activity_basic_info.head_pic}>" /> <{/if}> </td> </tr>