I believe I have traced my problem to using $FORM{'head'} rather than param('head') as the two replies have used. However when I try to use it in the same way I end up with an empty file. I have added use CGI qw(:standard); to the top of the script.

##### saves data to file
open (FILE,">/home/league/currentHeader.txt") or die "cannot open file
+: $!";
flock (FILE, 2) or die "cannot lock file exclusively: $!";
print FILE param('head');
close(FILE);
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I have tried the code above which I thought looked right but the file remains empty. Also tried declaring it first like this:

$heado = new CGI;
$headt=$heado->param('head');
open (HEAD,">$dataDir/currentHeader.txt");
flock (HEAD, 2) or die "cannot lock file exclusively: $!";
print HEAD $headt;
close(HEAD);
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What am I missing???
James