the simplest would be to use a hyperlink
echo "<a href=\"nextpage.php\">Link</a>";
alternatively you can sometiumes use a meta refresh if you want it to happen automatically:
(nb this goes in the head section of the site):
<meta http-equiv="refresh" content="no_of_seconds_to_wait;url=page.php/">
or, if you've not sent out anything to the browser already (ie no <html>, no <body>, not even an empty line...)
header("Location:nextpage.php")
That enough for starters?
