[tHE DSS]

For anything like this, you can use a function similar to the following :

PHP Code:

// check if value is EVEN function
function isEven($value) {
    return $result = ($value % 2 == 0) ? (true) : (false);
}

// usage example
$counter = 0;
while ($counter++ <= 10) {
    if (isEven($counter)) {
        // counter is an EVEN number, output, BLAH BLAH #01
    } else {
        // counter is NOT EVEN number, output BLAH BLAH #02
    }
} 


... basically, doing a 'modulus' operator divides 'x' by 'y', and returns the remainder.... as be do a modulus 2, if the number is not directly divisable by 2 (doesn't return a remainder of 0), then the number is not even, otherwise, it is.

Using that technique, you can display alternate stuff, depending on a counter being ODD or EVEN.