Thank you for your suggestion.
However, the image "Kidsbtn.gif" and similarly named buttons are loading okay and functioning okay both on preview and on the site. It is images like "images/mchomepage2.png" and "images/eyehomepage2.png" etc (as shown in the source code of the index.html page)that are not loading.
When you refer to spaces in file names, what exactly do you mean? Is it the space for example in between "Fireworks" and "content" in "Fireworks content/Kidsbtn.gif"?
"Fireworks content" is a folder where I have put the images I have made in Fireworks.