How send various urls from a loop?

I want to send N urls, using a loop to be able to send it many times.

For i=1 to N
send (url1)
sleep(a few secconds)
send (url2)
sleep(a few secconds)
send (url3)
sleep(a few secconds)
end

So I need to wait for each url were procesed before send the next url.

If I use HEADER it only will work for the last url of the last loop.

Some one could help me??

Try doing this, not sure if it would work since I'm sort of a newbie at this stuff.

$time = time();
while ($time > time()-5) {
$header .= "Location: Url1";
}

or try something with an array like in mysql_fetch_array functions....

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