function ChangeBackground(f)
{
var bg="#EEEEEE";
var farge=f;

	if (farge=="gul") {bg="yellow"}
	if (farge=="blue") {bg="darkblue"}
	if (farge=="dgray") {bg="#444444"}
	if (farge=="red") {bg="darkred"}
	if (farge=="green") {bg="darkgreen"}
	
document.body.style.background=bg;
}