Handling checkboxs (MySQL+PHP)

ALL -- The snipet below is used to generate the table containing product info (product_id(pid), title, amount) and checkboxs. When submit is clicked the data is passed to "instert into" sql statement. My question is how do I process checkbox when multi boxes have been check. I keep thinking a array is created by check boxes? -- David -------- order_form.php -------- // Define table echo "<br><table bgcolor=\"gray\" border=\"1\" >"; // Generate book listing $result = mysql_query("SELECT pid,date,title,subtitle,author,amount FROM catalog ") or die("Dis ain't right !!"); while ( list($pid,$date,$title,$subtitle,$author,$amount)=mysql_fetch_row($result)){ echo "<tr>\n"; echo "<td><input type=\"checkbox\" name=\"frm_pid\" value = \"$pid\" ></td>"; echo "<td>$title</td>"; echo "<td>Price: $amount</td>"; echo "</tr>\n"; } echo "</table>";