How to decrease canvas size for logo animation?

Hello all,

I have a logo animation with 1024px X 768px resolution on AE CS6. I need it to be a Head Banner for a website, so it needes to be with around 700px X 130px. How can I change the canvas size without stretching/loosing the configuration of the image?

There is no problem if I cut parts of the top and bottom of the video, I just can't change the logo proportion, and altought I don't need to show the entire effect, I need to show the entire logo.

Here is an example of what my animation looks like: http://videohive.net/item/fireball-opener/5073618?WT.ac=category_thumb &WT.seg_1=category_thumb&WT.z_author=ERAGUN

Thanks for the help!