Does hte job, clean and nice. Although, you could work through the dialog a little, and improve the coding of it. (It does the job, but could be remade to look more professional etc).

Also, a tip for the aliases:

instead of

alias exdialog {
  dialog -m Explorer Explorer
}

use

alias exdialog {
 if (!$dialog(explorer)) {
  dialog -m Explorer Explorer
  }
}

Just to avoid any errors ;p.

I didnt test it indeeph really, just generally.