Hello, there is a way with php4 dom to change the attributes, say witdh and height, of an youtube´s object in a variable?

for instance:
Code:
$string= '<object width="325" height="244">
<param name="movie" value="http://www.youtube.com/v/l1GAZLV1pz4&hl=es_ES&fs=1&"></param>
<param name="allowFullScreen" value="true"></param>
...