웹진 게시판인데요

아래 소스처럼 list페이지에 이미지가 없을시 no images이미지[<img src="no images.jpg"> ]가 나오게끔 하려면 어떻게 해야하나요?

<tbody>
 <?php
 for($i=0; $i<count($list); $i++){
  //썸네일 이미지 가져오기
  $thumb = get_list_thumbnail($board['bo_table'], $list[$i]['wr_id'], $board['bo_gallery_width'], $board['bo_gallery_height']);
  
  //본문내용 텍스트만 가져오기
  $str_content = cut_str(strip_tags($list[$i]['wr_content']),150);
 ?>
 <tr>
  <?php if ($is_checkbox) { ?>
  <td class="td_chk">
   <label for="chk_wr_id_<?php echo $i ?>" class="sound_only"><?php echo $list[$i]['subject'] ?></label>
   <input type="checkbox" name="chk_wr_id[]" value="<?php echo $list[$i]['wr_id'] ?>" id="chk_wr_id_<?php echo $i ?>">
  </td>
  <?php } ?>
  <td>
   <?php if($thumb['src']){ ?>
   <div class="img_area">
   <a href="<?php echo $list[$i]['href'] ?>" title="<?php echo $list[$i]['wr_subject']?>">
   <img src="<?php echo $thumb['src']?>" alt="<?php echo $thumb['alt']?>" width="<?php echo $board['bo_gallery_width']?>" height="<?php echo $board['bo_gallery_height']?>" style="border:1px solid #ebebeb;" /></div>
   </a>
   <?php }?>
   <div class="txt_area">
   <ul>
    <li class="zine_tit"><a href="<?php echo $list[$i]['href']?>"><?php echo $list[$i]['wr_subject']?></a></li>
    <li class="zine_info">등록일 <?php echo $list[$i]['wr_datetime']?></li>
    <li class="zine_con"><?php echo $str_content?></li>
    <li></li>
   </ul>
   </div>
  </td>
 </tr>
 <?php
 }
 ?>
 </tbody>