hidden("OldMaterialCost", $myrow["material_cost"]);
hidden("OldLabourCost", $myrow["labour_cost"]);
hidden("OldOverheadCost", $myrow["overhead_cost"]);
start_table($table_style2);
hidden("OldMaterialCost", $myrow["material_cost"]);
hidden("OldLabourCost", $myrow["labour_cost"]);
hidden("OldOverheadCost", $myrow["overhead_cost"]);
start_table($table_style2);