APEX

Hi all..

Please help with this issue.
I have a page where there are 2 buttons, I dont want the users
navigate away from the page by clicking any of the breadcrumbs or tabs links.
I want to show a confirm message.

I created a dynamic action with a ""unload"" event with the following code

var req = $v('p_request');
if (req == 'CANCEL' || req == 'GET_NEXT_DOC_ID')
  {
   alert('ok');
  }
else
  {

   var r=confirm("Are you sure you want to navigate away from this page?");
    if (r==true)
    {
    // They need to go the page that they clicked
    }
   else
    {
    // They need to stay on the current page.
     }

  }

Please let me know, how can i do this.

Thanks