in reply to unknown syntax error

Unrelated to this error, but you can write
for($i=0;$i<(scalar(@blocks));$i++)
more easy and more "perlish" as
for my $block (@blocks) {...}
Then you can replace $blocks[$index] by $block and do away with $i and $index.

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James

My blog: Imperial Deltronics