disable or turn off print dialog box on Internet explorer 8

Hi, I need to disable or turn off the print dialog box for an Kiosk application.. User needs to print letters directly on the local or default computer.. no need to select the printer , only quick print..

Please.   I'm using Windows XP and 7 IE8 

Some body has the solution?..  also change the registry to turn it off.. but i need to know how..

I'm using VB.net2008.

thanks in advanced.