First make sure that your motherboard supports booting from usb.
If it does then download Yumi
Plug in your pendrive.Format it in FAT filesystem.
Run the application goto the 'drive selection and distro options' page.
Select the pendrive from the dropbox.Then select 'try an unlisted iso' from the list and browse to and select your opensuse image and click create.
Never tried it myself but i think it will work.