find xml element by attribute using php

Hi.
I'm trying to read an xml file and replace a specific element data by using attribute id.

that's the xml structure:
<simpleviewerGallery>
<image id="4">
  <filename>ani4.swf</filename>
  <proName>Trake jeep8</proName>
  <upLine>PRODUCT #123543</upLine>
  <downLine>AGE 5 yrs, up</downLine>
  <textFileToload>Trake jeep8.txt</textFileToload>
  <flvFileToload>auto.flv</flvFileToload>
  <bigPic>j0331791.jpg</bigPic>
  </image>
</simpleviewerGallery>

The following code always replace the first element and not the one i need!
How should i fix it?

Thanks

$xml=simplexml_load_file('../pic/'.$galleryName.'/pic.xml');
foreach ($xml->image as $image) {
  if ($xml->image->attributes("id")==$id){
     $xml->image->proName=$proName;
     $xml->image->upLine=$upLine;
     $xml->image->downLine=$downLine;
     if ($video)
        $xml->image->flvFileToload=$video;
     if ($picture)
        $xml->image->bigPic=$picture;
     $xml->image->textFileToload=$proName.".txt";
     break;
  }

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