Ok I gotta know how to do this I have these error statements

if(!$q->param('name') || !$q->param('site') || !$q->param('siteid') ||
+ !$q->param('email') || !$q->param('pass') || !$q->param('repass') ||
+ !$q->param('des')) { &error("You Forgot some required fields"); }
 elsif($q->param('email') !~ /^\S+@\S+\.\S+/g) {
  &error("Your email is in a invalid format");
 }
 elsif($q->param('pass') ne $q->param('repass')) {
  &error("Your passwords don't match");
 }
else {
}

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In one of the elsif loops I need it too see if I siteid is taken, which is basically a directory, But how can I do that. 
elsif($q->param('siteid') eq @directory) { }

[download]

How am I going to check this.
updated by boo_radley : title change

In reply to How to check CGI params in if/elsif by Anonymous Monk

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