Wordpress plugin modding help

[Irish_Sniper]

I am using a wonderful calendar script from http://n0id.hexium.net/. Its for a website i'm making for my local swimming pool. What I want to be able to do is set for example Mondays timetable and have it repeat for a variable number of weeks, I have must of this done, but I am not sure if I am adding the days right and I am getting an ifinate loop. Heres the related snippet of code

<? 
$noofweeks=$_POST['noofweeks'];
$counter=1;
$time=explode(":",$_POST['time']);
$timestamp=mktime($time[0],$time[1],0,$_POST[month], $_POST[day], $_POST[year]);
$event_text=nl2br($_POST[text]);
if ($_POST[updating] == 1) {
$total=mysql_num_rows(mysql_query("SELECT * FROM $calendar_table WHERE timestamp = '$timestamp'"));
if ($total > 0) {
mysql_query("UPDATE $calendar_table SET text = '$event_text' WHERE timestamp = '$timestamp'");
_e('Calendar event successfully updated!','');
}
else {
while ($counter < $noofweeks) {
mysql_query("INSERT INTO $calendar_table VALUES('$timestamp','note','$event_text')");
$timestamp=mktime($time[0],$time[1],0,$_POST[month], $_POST[day] +7, $_POST[year]);
$counter+1;
}
_e('Calendar event successfully added!' ,'');
}

}
else {
while ($counter < $noofweeks) {
mysql_query("INSERT INTO $calendar_table VALUES('$timestamp','note','$event_text')");
$timestamp=mktime($time[0],$time[1],0,$_POST[month], $_POST[day] +7, $_POST[year]);
$counter+1;
}
_e('Calendar event successfully added!' ,'');
}

 

Thanks in advance for any help you can give or if you would like more information,

Donncha,