print '<form action="db2_update3.php?customerSRVCLI=' . $customerSRVCLI .'&customerSRVNUM=' . $customerSRVNUM . '" method="POST">';
print '<input type="submit" name="action" value="Update" /></form>'

print '<form action="db2_delete5.php?customerSRVCLI=' . $customerSRVCLI .'&customerSRVNUM=' . $customerSRVNUM . '" method="POST">';
print '<input type="submit" name="action" value="Delete" /></form>';

prova così
ciao