Need assistance with loop (to go t next page)

Experts,

My script works perfect.  However, I cannot go to the next page.  How do I correctly configure a loop?

There are generally about 40 to 60 open orders at any given time in increments of 25.

For example:
$url_2 = 'http://www.***electronics.com/b2b/openorders.php?search=&searchType=&start=0';
$url_2 = 'http://www.***electronics.com/b2b/openorders.php?search=&searchType=&start=25';
$url_2 = 'http://www.***electronics.com/b2b/openorders.php?search=&searchType=&start=50';
$url_2 = 'http://www.***electronics.com/b2b/openorders.php?search=&searchType=&start=75';

//NEED LOOP HERE (Increments of 25 - start=0, 25, 50 etc)

$url_2 = 'http://www.***electronics.com/b2b/openorders.php?search=&searchType=&start=0';//new url
	curl_setopt($ch, CURLOPT_URL,$url_2); // set url to go fetch
	curl_setopt($ch, CURLOPT_AUTOREFERER, true);
	curl_setopt($ch, CURLOPT_COOKIEFILE, 'cookie.txt');
	curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt');
	$buffer2 = curl_exec($ch); // run the process
	//echo $buffer2;

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