You can not modify the Toolbar's Print button nor can you modify the "File => Print" option, but you can modify a print Button on your form. The exact code will depend on the application you used to create the form.
AcroForms:
this.print({bUI: false, nStart: 1, nEnd: 1});
LiveCycle Designer you would need to modify the default print button action:
xfa.host.print(0, "1", "1", 0, 1, 0, 0, 0);