function toHex(dec) {
	var hexCharacters = "0123456789ABCDEF"
	if (dec < 0)
	return "00"
	if (dec > 255)
	return "FF"
	var i = Math.floor(dec / 16)
	var j = dec % 16
	return hexCharacters.charAt(i) + hexCharacters.charAt(j)
}

function setbgColor(red, green, blue) {
	document.bgColor = "#" + toHex(red) + toHex(green) +
	toHex(blue)
}

function fade(sred, sgreen, sblue, ered, egreen, eblue, step) {
	for(var i = 0; i <= step; ++i) {
		var red = Math.floor(sred * ((step - i) / step) + ered
		* (i / step))
		var green = Math.floor(sgreen * ((step - i) / step) +
		egreen * (i / step))
		var blue = Math.floor(sblue * ((step - i) / step) +
		eblue * (i / step))
		setbgColor(red, green, blue)
	}
}