Newbie Session question

I am building some arrays and hyperlinks inside a loop

while($row = mysql_fetch_array($result)) {
        $SApID[$n] = $pID;
        etc.
        <a href="javascript:picker(<?=$n?>)"><?=$category?></a></font></td>
        etc.
}

Can anyone suggest how to stuff the appropriate array value into a single
session array variable when a hyperlink is clicked?

I want to use something like

<SCRIPT LANGUAGE="JavaScript">
function picker(...$n...) {
        $SESSION["pID"] = $SApID[$n];
        etc.,   plus a redirect

but this will obviously never fly and as you can see my Javascript knowledge
is extremely basic.
Maybe there is a better way?  It must be a single value session solution.
Yes, I tried looking through the archives.  8=)
Thanks,
Chris