Problem with category images

[Sushigal]

I'm very new to this and seem to be having a problem with category images. I've chosen to display my category images on the main/home page. When I upload an image it appears fine, however it's zen carts set size which is too small and I really want the images to be around 125x125 pixels, so I uploaded the image via the second way described in the zen cart book; I put my 125x125 image into zencart/images (general image folder) and uploaded it, then went and edited the category who's image I wanted to make bigger, and typed in the file name of my 125x125 image without the file path as directed in the guide book so for example, say my image file is called jewellery.jpg that's what I typed in the field titled 'select an existing image file from server, filename:' I then click save and then go to my website, click refresh and the image doesn't appear, only the broken image sign or the image does appear, but it's only 57x57 pixels? Then I have another category with an iamge displayed, and that one is 45x57 pixels? Does zen cart only display a certain autosized category image?? I'm a bit confused, please help!

[tophand]

Admin-->Config-->Images
To adjust/set image sizes.