thats got it, not sure what the filter should be as what I have set up isnt working:
<?php
$WADAtimesheet_insert = new WA_MySQLi_RS("WADAtimesheet_insert",$DBConnection,1);
$WADAtimesheet_insert->setQuery("SELECT * FROM timesheets WHERE TimesheetID = ?");
$WADAtimesheet_insert->bindParam("i", "".(isset($_SESSION['WADAtimesheet_insert'])?$_SESSION['WADAtimesheet_insert']:"") ."", "-1"); //colname
$WADAtimesheet_insert->execute();
?>