function getImgNum(maxNumImg) {	
	bwHomeImg = readCookie('bwHomeImg');
	
	currentPlace = 0;
	if (bwHomeImg)
		currentPlace = bwHomeImg;
				
	nextPlace = parseInt(currentPlace)+1;
	if (nextPlace > maxNumImg)
		nextPlace = 1;
		
	saveCookie('bwHomeImg', nextPlace, 360);
	
	return nextPlace;
}