How to break printing in open printing with dialog

[Reinhold Venzl-Schubert]

Hi!

When I use the "open printing with dialog" command, my Mac offers me  
"Print" or "Cancel". When I choose "Cancel" metacard opens the dialog  
again. The only way I have is to print.

How can I change my script to break printing in case I choose "Cancel"?

   open printing with dialog
   print marked cds
   close printing

Thanks for help
Reinhold