Currently Being ModeratedMay 3, 2012 11:26 AM (in response to glabarone)
Unfortunately, connecting your printer to the AirPort Express does not make it AirPrint compatible. You need to have a specific AirPrint compatible printer to be able to print directly to the printer using your iPad.
Check this Apple support document for more details on AirPrint.
If you have a Mac, you might be able to use a workaround using an app like Printopia. There is a free trial, so you will know in a matter of minutes whether this will work for you or not. Just remember that your Mac must be running in order for this to work.