If you put [ resize ] [ img ] [ /img ] [/resize ] tags around your picture, it will adjust to whatever window-width browser is. So if you have full-screen browser, picture is as wide as screen. If you size window down to 1/2 screen, picture is also 1/2 screen. No editing of your original pictures needed. For example, this picture is 3698-pixels wide:
Maximize browser on huge screen and it fills screen.. Another example:
