一个上传多个图片的js技巧

<script language="JavaScript">
var num=1;
function show(obj){
if(obj.checked){
document.all.photoyn.style.display="";
document.all.photoyn.innerHTML="<input type=/"file/" size=/"25/" name=/"photopath/" class=/"upfile/"><font color=/"red/">（只允许700K以内的GIF或JPG图片）</font><table id=/"TB/" width=/"100%/" height=/"0px/" border=/"0/" cellpadding=/"0/" cellspacing=/"0/"><tr><td></td></tr></table><input type=/"button/" value=/"＋/"title=/"增加一个上传/" onclick=/"oRow=TB.insertRow();oCell=oRow.insertCell();oCell.innerHTML='<input type=file size=25 name=photopath'+Number(num)+' class=upfile>';num=num+1/">  <input type=/"button/" value=/"－/" title=/"去掉一个上传/" onclick=/"oCell=TB.deleteRow()/">";
}else{
document.all.photoyn.innerHTML="";
document.all.photoyn.style.display="none";
}
}
</script>
是否上传照片？<input type="checkbox" name="nfile" id="nfile" onclick="show(this)">
<div id="photoyn" style="display:none;padding:2px 0 5px 0"></div>