Printer Window Problem

I am using print o matic plugin with this website: http://www.dalivery.com.ph When printing the waybill, the plugin creates a new browser window with all the elements of the form that I want to be printed, however, the printer window does not automatically open. In one of your examples http://biz130.inmotionhosting.com/~musice10/wp/amalfi-registration/, the printer window automatically opens. Please help me. Thanks in advance

http://wordpress.org/extend/plugins/print-o-matic/