The errors are mostly found for you in the error messages. One thing to note is that you are using the numerical operator == rather than eq.

I'm not sure what

if ( $me3400(1) == /cp me340x-metrobase-mz \/tftpboot\/$u\/me340x-metr
+obase-mz/ ) 
{
[download]

means but you would probably be better off with something like:

if ( $me3400(1) eq "cp me340x-metrobase-mz /tftpboot/$u/me340x-metroba
+se-mz" ) 
{
[download]