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if ( $mode eq "add" ) {
 # print add page form
...
if ( $mode eq "save" ) {
 # save add form infos
}

print hidden( 'mode' , 'save' );

<input type="hidden" name="mode" value="add"  />

print hidden( 'mode' , 'save' );

<input type=hidden name=mode  value=save />

$query -> delete('mode');

$query -> delete_all();