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<script>
function changeRegion()
{
	self.location = "<?php echo "{$PHP_SELF}?m={$m}&c="; ?>" + document.getElementById('c').value;
}	
</script><?php

$country_list = [
	"LA",
	"USA",
	"AUS",
	"BRA",
	"CAN",
	"CHN",
	"EU",
	"IND",
	"JPN",
	"RUS",
	"SEA",
	"TUR"
];

if (strlen($c)<1) $c="USASEA"; // BRA"; // need to get from parameters

echo '<label for="c">Choose a region:</label><select name="c" id="c" onchange="changeRegion();" onfocus="this.selectedIndex = -1;">';
foreach($country_list as $v)
{
	echo "<option value=\"{$v}\">{$v}</option>";
}
echo "</select>";

?>