JS实现动态添加图片上传，多个单图添加

HTML代码：
  <tr class=tdbg >
        <td  valign="middle"  align="right" >产品图组：</td>
        <td >图推荐尺寸：376*376        </td>
      </tr>
	    <tr class=tdbg ><td  colspan=2 >
           <div id="sch2">
		<div id="xingcheng-box">
			<div class="daysbox"><dl>
		        <dt><b>第1张：</b><em></em></dt><dd><input name="smallpic0" value="" id="smallpic0" type="TEXT" size=35 maxlength=100 >   
			<span onClick="javascript:previewObj('img','',document.Gforms.smallpic0.value)" class="preview">查看</span>  
			<span onClick="javascript:delFile('',document.Gforms.smallpic0)" class="preview">删除</span> 
			<iframe src="../ueditor/sanways_upload.asp?u=smallpic0" scrolling="no" topmargin="0" width="300" height="24" marginwidth="0" marginheight="0" frameborder="0" align="center"></iframe></dd>
		        </dl>
                        </div>
		</div>
		<div class=xingchengadd>
			<a href="/go.html?url=#?" onclick="xingcheng_add_day();return false;"><img src='../img/btn_add.gif' class='pointer' align='absmiddle'/> 添加第<b id="xingcheng-next-day-no">2</b>张</a>
			<input type="hidden" id="xing_day" name="xing_day" value="1" />
		</div>
	   </div></td></tr> HTML代码：
  <tr class=tdbg >
        <td  valign=