Problems are often solved with the simplest solution. Simply add an elsif statment. Hope this helps..
E.g.

if($whatever eq $whatever2) {
#do whatever you wana do;
}
elsif ($what ever you want eq " "){
#Access Denied;
}
else{
#do whate ver you wana do here;
}
[download]

You get my point.
All the best, Eoin...