var podmianki = new Array();
var podmiankiNames = [
	"zboza",
	"rzepak",
	"kukurydza",
	"ziemniaki",
	"warzywa",
	"sady"
];
var imageSwaped = [
	false,
	false,
	false,
	false,
	false,
	false
]
function preloadImages(){
	for(var i=0;i<6;i++){
		podmianki[i] = new Image();
		podmianki[i].src = img + podmiankiNames[i] + "_.jpg";
	}
}
function swapImage(no){
	if(!imageSwaped[no]){
		document["photosMenu"+no].src = img + podmiankiNames[no] + "_.jpg";
		imageSwaped[no] = true;
	} else {
		document["photosMenu"+no].src = img + podmiankiNames[no] + ".jpg";
		imageSwaped[no] = false;
	}
}