How to select a right item from drop-down list

I like to know how to get to the selected item from drop-down list in
perl, below is a portion of the code. A user select an item from
drop-down list & click go, by clicking go the script pick the selectes
item, open data file and replace existing one with selected item .
I have another hidden submit button with different value "value =
some_other_value" and name is "Submit_list", but when I click go button
the other submit button the hidden one takes effect!
So there are two question here:
1- How to use if in the drop-down list ?
2 Why the other submit button takes effect when I click go button?

The other submit button:
print " NAME=Submit_list VALUE='$path'>
\n";
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some other code are here
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printf "
-- Make a selection --
Pass All
Fail All
Auto All
";
printf "";


if ( Submit_Action eq "Go" ) {
if (action == 1) {
my $data_file =some data
my $replace = `perl -pi -w -e 's/yes/no/g;' $data_file`;
}
}