//random 
function randomrep($content,$break,$banner){
$page = $content;
$page = explode ("\n", $page);
for ($i = 0; $i < count($page); $i++) {
	if (0 != preg_match('/<'.$break.'>/i', $page[$i] )) {
		$r++;
	}
}
$r2 = rand(0, $r);
for ($i = 0; $i < count($page); $i++) {
	if (0 != preg_match('/<'.$break.'>/i', $page[$i] ) and $i == $r2) {
		$page[$i] = preg_replace('<<'.$break.'>>', '<'.$break.'>'. $banner . '<'.$break.'>' , $page[$i]);
	//	$r++;
	}
}
echo implode($page);
}