I have been learning about css and the tutorial used two .gif graphic in order to produce grey backgrounds on the side columns. ( actually it is css for a Joomla
template - but I dont think that matters). I wanted to change the color to green but when I opened the gif in paintshop or in freehand, I couldn't work out how the image was made. The images change with the window - ie are resizable.
I made an image by filling a box with color but it didn't re-size.
I have put the images files on the following page so that you can see what they are and download if you want.
I would like to know how these images are made and how can I edit the color or make other ones.
Thanks for any help.