ASP.NET上传图片时，产生预览

<tr bgcolor=#f5f5f5> <td height=30 align=center valign=middle>图片链接</td> <td height=35 align=center valign=middle><input type=file name=uploadfile1 runat=server id=uploadfile1 onpropertychange=document.all.imgID.src=file:///+this.value> &nbsp; </td> </tr> <tr bgcolor=#f5f5f5> <td height=70 align=center valign=middle>缩略图</td> <td height=70 align=center valign=middle><img id=imgID width=82 height=65 border=0 >&nbsp; </td> </tr>