<?php
switch($dropdown_value) {
case ("Great Britain"):
$table_name = "greatbritain";
break;
case ("Scotland"):
$table_name = "scotland";
break;
}
$query = "INSERT INTO " . $table_name . " VALUES ";
$query .= "(" . $val1 . "," . $val2 . ")";
// now run your query
?>
If your tables are all setup the same just turn your table_name into a variable that is either set by the dropdown box, or can be set by that value. I did the latter up above just to show it, but it'd be cleaner just using the dropdown value as the table name.