hello~~~ guys~~~ set by1 [$dest1 set bytes_] set by2 [$dest2 set bytes_] set by3 [$dest3 set bytes_] Could I replace this part of script by for {set i 0} {$i < 4} {incr i} { set by$i [$dest$i set bytes_] } ???? If can't, what should I do? thanks... :) Jay...