Page navigation doesn`t work - Joomla! Forum - community, help and support

i have problem developing of own component. component works fine when click on save button , there wrong example input empty. there come message on screen error (a javascript allert). when click on ok button of javascript alert user must go back. code have build in function block save($option).

code:

[php]
echo "\n";
exit();
[/php]

this happen when user click on ok button of javascript alert: webpage has expired

there wrong.

code standard component navigation:

[php]


[/php]

this code joomla knows wich page is, doesn`t work.

thanks!