fopen(); selecting a bit of the page to display?

[MtPHP2]

I got
$availserver = fopen("url", "r");
print $availserver;
But how can I like say tell it just to print charecters 136-149 of the HTML source outputted by the page?

[Rayn]

fseek($availserver,136);
$output = fread($availserver,13);

I believe.