If you use Window$ XP, there is a free Power Toy that you can use.
It's a few down on the right.
Once installed, all you need do is right click on the image and you will see Resize Image in the menu.
All the best, Paul.
Kodak DC3200, CX6230, P850 + 0.7 W/A lens, P20 flash.
Nikon N90s (35mm), D70 + Tamron 19-35mm f/3.5-4.5, Tamron 28-75mm f/2.8, Sigma 28-105mm f/4-5.6, Nikkor 50mm f/1.8, Sigma 70-300mm f/4-5.6 APO Macro, Tokina 80-200mm f/2.8, Pheonix 100mm f3.5 1-1 Macro, Sigma 170-500mm f/5-6.3 APO.
Nikon F6 coming soon.....