prova cosi...

<form name="invioUP" action="uploadformstatici3.php" method="post">
<?

for ($i=0; ($i <= $lungh-1); $i++) {
?>
<input type="hidden" name="source<?php echo $i; ?>" value="<? echo $sorgente[$i]; ?>">
<input type="hidden" name="dest<?php echo $i; ?>" value="<? echo $destinazione[$i]; ?>">
<?
}
?>

<input type="submit" name="Ok" value="OK">
</form>

//nella pagina uploadformstatici3.php
for ($i=0; $i<=($nfoto-1); $i++) {
$s[$i]=$_POST['source'.$i];
$d[$i]=$_POST['dest'.$i];
}

fammi sap se funziona...