using a for loop like that is not the right way to do this. Use a repeat region, before the repeat region code, initialize $i = 0, do the modulus comparison inside the repeat region, and increment $i as the last instruction of the repeat:
<?php $i = 0; // initialize $i ?>
<?php do { // start repeat ?>
<?php
if($i % 2) { // Modulus comparison
echo("Home<br />");
} else {
echo("Domestic<br />");
}
$i++; // increment $i
?>
<?php } while ($row_rsTopMenu = mysql_fetch_assoc($rsTopMenu)); // end repeat?>