Help deleting items from cart script

[dragon_sa]

I would like to know how to delete items from this cart if $itemqty is set to 0, at present it modifies the cart item quantities by entering a number in a form and hitting order to update this cart, I would like it to delete the item from the cart if the quantity is set to 0.
Any help appreciated tku.

here is my code for creating the cart

<?php
$basket = $_POST['basket'];
$itemprice = $_POST['price'];
$id = $_POST['id'];
$itemqty = $_POST['quantity'];
if (($basket!="") && (!empty($_POST['submit']))){
      if (session_is_registered("ses_basket_items")){
      $basket_position_counter=0;
      $double=0;
      if ($ses_basket_items>0){
         foreach ($ses_basket_name as $basket_item){
            if ($basket_item==$basket){
               $double=1;
               $basket_position=$basket_position_counter;
            }
            $basket_position_counter++;
         }
      }
      if ($double==1){
         $ses_basket_amount[$basket_position]=$itemqty;
         $newprice=$itemprice*$itemqty;
         $ses_basket_price[$basket_position]=$newprice;
      }else{
         $ses_basket_name[]=$basket;
         $ses_basket_amount[]=$itemqty;
         $ses_basket_price[]=$itemprice;
         $ses_basket_id[]=$id;
         $ses_basket_items++;
      }
   }else{
      $ses_basket_items=1;
      $ses_basket_name[0]=$basket;
      $ses_basket_amount[0]=$itemqty;
      $ses_basket_price[0]=$itemprice;
      $ses_basket_id[0]=$id;
      session_register("ses_basket_items");
      session_register("ses_basket_name");
      session_register("ses_basket_amount");
      session_register("ses_basket_price");
      session_register("ses_basket_id");
   }
}

if ($ses_basket_items>0){

 echo "<table cellpadding='0' cellspacing='0' border='0' width='230'><tr><td class='carthead'>ITEM</td><td align='center' class='carthead'>QTY</td><td class='carthead' align='right'>TOTALS&nbsp;</td></tr>";
   for ($basket_counter=0;$basket_counter<$ses_basket_items;$basket_counter++){
      $price=sprintf("%01.2f",$ses_basket_price[$basket_counter]);
      $quantity=$ses_basket_amount[$basket_counter];
      $name=$ses_basket_name[$basket_counter];
      echo "<tr><td width='130px' align='left' class='cart'>$name</td><td width='50px' align='center' class='cart'>$quantity</td><td width='50px' class='cart' align='right'>\$$price&nbsp;</td></tr>";
   }  

   $totalprice=sprintf("%01.2f",array_sum($ses_basket_price));
   $totalitems=array_sum($ses_basket_amount);
   echo "<tr><td align='left' class='cartbot'>CURRENT TOTALS:</td><td align='center' class='cartbot'>$totalitems</td><td align='right' class='cartbot'>\$$totalprice&nbsp;</td></tr></table>";
} else {
   $ses_basket_items=0;
   unset($ses_basket_name);
   unset($ses_basket_amount);:confused:
   unset($ses_basket_price);
   unset($ses_basket_id);
}
?>