echo "What's the minimum price I would have to sell back at to break even?
if($_GET['volume']>0 && $_GET['ppb']>0 && is_numeric($_GET['volume']) && is_numeric($_GET['ppb']) && $_GET['fee']>0 && is_numeric($_GET['fee']))
{
$volume = $_GET['volume'];
$ppb = $_GET['ppb'];
$fee = $_GET['fee'];
$fee_c = ($fee / 1000); //yea, I know...decided to not use the full percentage
$total_buy = $volume * $ppb;
$min_sell = $total_buy + ($total_buy * $fee_c);
$minMarket_low_sell = ($min_sell / $volume);
echo "[Volume]: ".$volume."
echo "[Buy]: ".$total_buy."
echo "[Sell]: ".$min_sell."
echo "Minimum sell when Price Per Bitcoin is ".$minMarket_low_sell."USD to break even.
} else {
echo "" ;
echo "Buy @ .mtGoxAvg()."'>
echo "Fee 0.% ;
echo "" ;
}
function mtGoxAvg()
{
$opts = array(
'http'=> array(
'method'=> "GET",
'user_agent'=> "MozillaXYZ/1.0"));
$context = stream_context_create($opts);
$json = file_get_contents('https://mtgox.com/code/data/ticker.php', false, $context);
$jdec = json_decode($json);
return $jdec->{'ticker'}->{'avg'};
}
?> 
echo "What's the minimum price I would have to sell back at to break even?
if($_GET['volume']>0 && $_GET['ppb']>0 && is_numeric($_GET['volume']) && is_numeric($_GET['ppb']) && $_GET['fee']>0 && is_numeric($_GET['fee']))
{
$volume = $_GET['volume'];
$ppb = $_GET['ppb'];
$fee = $_GET['fee'];
$fee_c = ($fee / 1000); //yea, I know...decided to not use the full percentage
$total_buy = $volume * $ppb;
$min_sell = $total_buy + ($total_buy * $fee_c);
echo "[Buy]: ".$total_buy."
echo "[Sell]: ".$min_sell."
echo "You paid ".$total_buy." USD for ".$volume." BTC; you will need to sell back at ".$min_sell." USD to break even.
} else {
$mtGoxAVG = mtGoxAvg();
echo "" ;
echo "Buy @ .$mtGoxAVG."'>
echo "Fee 0.% ;
echo "" ;
}
function mtGoxAvg()
{
$opts = array(
'http'=> array(
'method'=> "GET",
'user_agent'=> "MozillaXYZ/1.0"));
$context = stream_context_create($opts);
$json = file_get_contents('https://mtgox.com/code/data/ticker.php', false, $context);
$jdec = json_decode($json);
return $jdec->{'ticker'}->{'avg'};
}
?> 
best up-and-down is after any big move, sell or buy does not matter. when the panic stops price goes up-down 1-2$ several times while seeking an average, that's the time to play. 
