一个表单能否同时上传两张图片？？？（急）

form:
<input name="picture" type="file" size="30">
<input name="picture2" type="file" size="30">
<input type="submit" name="submit" value="上传">处理程序：
if($picture!="none"&&$picture!="")
{
  $picture_ext=strtolower(strstr($picture_name,"."));
  $picture_file="picture1".$picture_ext;
  if(file_exists($picture_file))  @unlink($picture_file);
  if(!copy($picture,$picture_file))
  {
    echo "复制图片文件1[$picture]到[$picture_file] 失败...<br>\n";
    exit();
  }
  @unlink($picture);
}
if($picture!="none"&&$picture!="")
{
  $picture2_ext=strtolower(strstr($picture2_name,"."));
  $picture2_file="picture2".$picture2_ext;
  if(file_exists($picture2_file))  @unlink($picture2_file);
  if(!copy($picture2,$picture_file))
  {
    echo "复制图片文件2[$picture2]到[$picture2_file]失败...<br>\n";
    exit();
  }
  @unlink($picture2);
}