The Quickest Way to Resize Image from 100x160 to 80x129 in GIMP?

I have many many pictures to resize to 80x129 for a project. Some are smaller than 80x129, some are larger. Isn't there a command in Gimp that will quickly resize these images.

Currently I am doing this:
File -> Open, select image.
Right Click, Image -> Scale Image..., to 100x150 (only if images are smaller than 80x129).
Shift+T to scale back down to 80x129.
R to crop the image, because there is invisible background (this is a hassle because i need to find the 80x129 coordinate with my mouse, and then my 0x0 coordinate :-/.

Please some one enlighten me! There must be a quicker way.

Microsoft power toys......Image resizer.. try that one....

http://www.microsoft.com/windowsxp/d...powertoys.mspx

Not so sure if this is what you need....

Edited: I think i am wrong.. sorry...

kirktrix, thanks for trying. the image resizer almost worked, but images ended up becoming 83x129, 78x129 etc instead of 80x129.

well i'm off to bed. hopefully some one will have posted a quicker way by then!

try installing this and then navigate to layer > liquid resize.