I'm dumb. But I like to post sometimes. That, and I'm unsure what you're trying to include. However,
<a href="http://www.mysite.com/<?PHP ($_GET["id"] + 1) ?>">
might work (other than bad quote escaping I might have). Also, are you using some URL rewriting or are your files really named
www.mysite.com/1 ,
www.mysite.com/2 ,
www.mysite.com/[x] ?
blah blah blah... here's a bump since I'm dumb
