WordPress MU

I have some code I want to run hard coded in a theme. But the code is slightly different for each blog. So I need a bit of php and a function I think - I think it's somethin like this;

<?php
switch ($i) {
case "blog1":
do this;
break;
case "blog2":
do this;
break;
case "blog3":
do this;
break;
}
?>

$blog_id is global. But I'd set it up with the following syntax rather than how you've started:

<?php
global $blog_id;
if ($blog_id == 63) {
   echo 'hello fortunate ones';
 }
if ($blog_id != 63) {
   echo 'hello unfortunate ones';
  }
 ?>

That would be great but the will be more then just two options, could end up with 100 but just a 5 or 6 to start.