So, how do the variables that you want to pass enter the message?

For example, if there is a space between each variable and an equals sign between each value (ie. var1=var1 var2=var2 var3=var3), and they are just entered in on ine line, you'd probably want something like this:

chomp $body; # To get rid of the Carriage Return from the STDIN

foreach my $temp (split(/ /,$body)) { # This will generate a loop for 
+each variable/value pair by splitting on spaces
    my @variable = split (/=/,$temp); # This splits by the equals sign
+ that is delimiting our values and variable names
    
    $vars{$variable[0]} = $variable[1]; # So generate a hash of the va
+riable name and the variable value
}
[download]

This will allow you to generate the proper hash that you need to pass.
As far as the web stuff goes, I'd better leave that to somebody else as I really haven't got a huge amount of experience with it, but it looks OK to me.