I want to use a specific image for a back ground on my web site. but when I place it as a background in Expression web 3 and preview my changes the image does not fit the browser. probably simple but not for me. I hope some one and give me a clue. I was told to give the image a 100% dimension but how is this done Thanks Dave
A background image won't expand to fit the browser, it might repeat or tile in one or both axes, but only if you tell it to do so.
You're asking software specific questions in a general web design forum, so you're unlikely to get great answers, no matter how many times you ask.
Try looking at the software help screens and poking about in the options panel for the page.
But it won't expand, only tile...
As was already mentioned, there is no standard to make a background image expand to the page size. However, if you really wanted to do that, you could try instead to use an and give it the desired width. Obviously, this would not really be in the background, so you might try to make the other elements float over it with transparent backgrounds.
I have never tried this as I can not imagine a need. Most layouts these days are static. I joined that trend when I realised that the modern browser window is wider than people like to read text. With at least an upper bound in place, and considering that those who surf with smaller size monitors won't want to download such a large image means that you might have some better options available. This is subjective but may save you a headache.