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my $statement2 = "select unit_name from unitNamesTable";
my $sth = $dbh->prepare($statement2);
$sth->execute();
...
        print "<input type='hidden' name=unit_name value='$unit_name'>
+";    
        print "<input type='image' name='$unit_name' id='$unit_name' a
+lt=airConButton src='../../images/unit.jpg' height='100px' width='100
+px' onclick='document.forms[0].unit_name.value =\"$unit_name\";this.f
+orm.submit()'></input>";
    }