Why don't you try something like...
"links.php?site=8"
? The variable is called site. Now to go further, perhaps $site could be a two dimensional array. Therefore something like..
"echo $site[8];"
would return, for the sake of the example, phpbuilder.net.
If you don't know how to setup 2D arrays, the manual is very helpful in this area.
Later on and hope that helped,
Big Din K.R.