images and page layout

[Stina]

Hi,
I really wanted to dreate my own layout and have now come up with one I love. It contains two photos which have been connected by coloumns of colour and background coulour, but when I tried to load it, I was told it wasn't supported??? What do I do? Will I need to pay for other programs and downloads, to be able to use VodaHost?
And if you set up and publish a site, can you keep changing it, main layout, colours etc, after it is live?
Regards
Stina

[Stina]

I forgot to say, that I did save the image as jpeg.

[Stina]

Sorry, it actually says "unexpected format" ???? What does that mean? How can I change it? And if the entire layout is coulour and images, how do I make sure that it is upladable for people(I did use the pixresize, but will the image still cover the whole page?)

[Stina]

I just figured it out!! Now I need to know how to set the size, so that it is the size of a website. (I want the whole image to fill the entire page)
Sorry about my cluelessness!!!