I'm using Firefox but try this:
On the auction page that you're trying to get the pictures from;
Using your mouse, right click on the page, then select 'View Page Info'.
The Page Info page will open. Now click the 'Media' tab. It will show you all the url image links on that page.
Scroll down until you find
http://i.ebayimg.com , once you find that right click on that url and select Copy.
Now before the .JPG there is a #(1st i.ebayimg.com should end with 35.) The #'s can be changed.
The first ebayimg you find is the one that is the largest on the page @ the time(as stated above it ends with 35).
The remaining ebayimg's you find are the one's that appear as thumbnails....those will end with 14 followed by .JPG
To make the image bigger just copy and paste the link but change the 14 to 35.
On another note, it you want to make it the largest size possible change it from 35 to 12.
Here is an example of the same picture but in the 3 different sizes.
14 - small
35 - medium
12 - large
Now I didn't mention that after you copy the 1st image you should then paste it and do the same for each image thereafter, as I figured one knows to dothat already.
Hope this helps!