js原来可以这样写

<table>
	<tr>
	  <td width="24%" height="22" align="right" bgcolor="#FFFFFF" valign="center">是否图片栏目:</td>
	  <td width="76%" height="22" align="left" bgcolor="#FFFFFF">
		<select name="isPhotoCategory" onchange="if(this.options[this.selectedIndex].value=='N'){uploadCategoryPicTr.style.display='none';}else{uploadCategoryPicTr.style.display='block'}">
		  <option value="Y"  >是</option>
		  <option value="N" selected >否</option>
		</select>
	  </td>
  </tr>
  <tr id="uploadCategoryPicTr" style="display:none">
	  <td width="24%" height="22" align="right" bgcolor="#FFFFFF" valign="center">上传图片:</td>
	  <td width="76%" height="22" align="left" bgcolor="#FFFFFF">

	<img src="/octopus/images/common/btn/btn_sz.gif" style="cursor: hand;" onclick="window.open('/octopus/jsp/htmledit/uploadContentImg.jsp?module=001002001', '图片上传', 'width=578, height=200 ','alwaysRaised=1')">

	<input name="contentPhotoPath" type="hidden" value="">
	</td>
  </tr>
   <tr id="ddd" style="display:block">
	  <td width="24%" height="22" align="right" bgcolor="#FFFFFF" valign="center">上传图片:</td>
	  <td width="76%" height="22" align="left" bgcolor="#FFFFFF">

	<img src="/octopus/images/common/btn/btn_sz.gif" style="cursor: hand;" onclick="window.open('/octopus/jsp/htmledit/uploadContentImg.jsp?module=001002001', '图片上传', 'width=578, height=200 ','alwaysRaised=1')">

	<input name="contentPhotoPath" type="hidden" value="">
	</td>
  </tr>
</table>