It's not really that hard to do this, but there's a problem - if they change their layout your code will break..
You can open the file in PHP with the following line:
$handle = fopen("http://biz.yahoo.com/p/c/csco.html", "r");
then you can read the page as you would with an ordinary file:
$data = "";
/* until eof on $handle */
while (!feof($handle)) {
$data .= fgets($handle);
}
Now you have all the html-code in the string $data. It's easy to modify it (removing useless tags and such) with regular expressions. Read more about this in the PHP-documentation, ie http://www.php.net/manual/en/function.preg-match.php
Good luck,
Olle