how to add dates from the prevoius / next month?

[newb]

How can i add dates from the previous / next month to the calendar for this calendar script? id like it to appear so its like:

 

28 29 30 31 1 2 3 4 5 6 etc.. then at the end 29 30 31 1 2 3 etc...

 

function av_calendar () {
$monthNames = Array("January", "February", "March", "April", "May", "June", "July", 
"August", "September", "October", "November", "December");
if (!isset($_REQUEST["sm"])) $_REQUEST["sm"] = date("n");
if (!isset($_REQUEST["sy"])) $_REQUEST["sy"] = date("Y");
$cMonth = $_REQUEST["sm"];
$cYear = $_REQUEST["sy"];

$prev_year = $cYear;
$next_year = $cYear;
$prev_month = $cMonth-1;
$next_month = $cMonth+1;

if ($prev_month == 0 ) {
	$prev_month = 12;
	$prev_year = $cYear - 1;
}
if ($next_month == 13 ) {
	$next_month = 1;
	$next_year = $cYear + 1;
}
//
$today = date('d');
echo '
	<div class="head">
	<h1>'.$monthNames[$cMonth-1].' '.$cYear.'</h1>
	</div>
	<div class="blockitem2">
<table width="100%" class="calendar" style="margin-left:-10px;" border="0" cellpadding="2" cellspacing="2">
<tr style="font-size:20px">
<th align="center"><strong>S</strong></th>
<th align="center"><strong>M</strong></th>
<th align="center"><strong>T</strong></th>
<th align="center"><strong>W</strong></th>
<th align="center"><strong>T</strong></th>
<th align="center"><strong>F</strong></th>
<th align="center"><strong>S</strong></th>
</tr> ';
$timestamp = mktime(0,0,0,$cMonth,1,$cYear);
$maxday = date("t",$timestamp);
$thismonth = getdate ($timestamp);
$startday = $thismonth['wday'];
	$sy = date("Y",$timestamp);
	$sm = date("m",$timestamp);
	$sd = date("d",$timestamp);


for ($i=0; $i<($maxday+$startday); $i++) {
$day = ($i - $startday + 1);


	if(($i % 7) == 0 ) { echo "<tr>\n"; }
	if($i < $startday) { echo "<td></td>\n";
	} else {
	$now = "$sy-$sm-$day 00:00:00";
	$then = "$sy-$sm-$day 23:59:59";
	$sql = "SELECT av_episodes.id,av_episodes.date FROM av_episodes WHERE date between UNIX_TIMESTAMP('$now') AND UNIX_TIMESTAMP('$then')";
	$query = exec_mysql_query($sql)  or die(mysql_error());
	$rows = mysql_num_rows($query);
	$nowurl = "$sy/$sm/$day/";

		if(!empty($rows)) {
		echo "<td class='dates' align='center' valign='middle' height='20px'><b><a href='".SITE_URL."updates/".$nowurl."'>". add_nulls($day) . "</a></b>";
		} else { 
		echo "<td class='datesInactive' align='center' valign='middle' height='20px'>". add_nulls($day) . "";
		}
		echo "</td>\n";





	if(($i % 7) == 6 ) {echo "</tr>\n";	}



}
}
echo '</table></div>
';

[newb]

anyone?