Html Replacement

[knowledge]

How to find and replace table width and image width in plain html files.
example
if actual image width is 280
<table width="100%">
<img src="" width="280">

I want to replace width=10% width=28
<table width="10%">
<img src="" width="28">

[znouza]

eg

preg_replace(array("/width=\"100%\"/","width=\"28\""),array("width=\"10%\"","width=\"28\""),$text);