var newimg_location="css/images/newimages/";
var oldimg_prefix="oldimg_";
var oldimg_suffix=".jpeg";
var newimg_prefix="newimg_";
var newimg_suffix=".jpeg";
var max_oldimg_count = 9;
var max_newimg_count = 6;

function init_image_switch() {
	
	if(navigator.cookieEnabled) {
		//cookie_oldimage_switch();
		//cookie_newimage_switch();
		random_oldimage_switch();
		random_newimage_switch();
	}
	else {
		random_oldimage_switch();
		random_newimage_switch();
	}
}

function cookie_newimage_switch() {
	var cookie_newimg = readCookie("newimg");
	if(cookie_newimg==null) {
		createCookie("newimg",1,1);
		cookie_newimg = 1;
	}
	if(++cookie_newimg > max_newimg_count) {
		cookie_newimg = 1;
	}
	newimage_switch(cookie_newimg);
	eraseCookie("newimg");
	createCookie("newimg",cookie_newimg,1);
}
function random_newimage_switch() {
	var number = Math.floor(Math.random()*(max_newimg_count));
	if(++number > max_newimg_count) {
		number = 1;
	}
	newimage_switch(number);
}
function cookie_oldimage_switch() {
	var cookie_oldimg = readCookie("oldimg");
	if(cookie_oldimg == null) {
		createCookie("oldimg",1,1);
		cookie_oldimg = 1;
	}
	if( ++cookie_oldimg > max_oldimg_count ) {
		cookie_oldimg = 1;
	}
	oldimage_switch(cookie_oldimg);
	eraseCookie("oldimg");
	createCookie("oldimg",cookie_oldimg,1);
}
function random_oldimage_switch() {
	var number = Math.floor(Math.random()*(max_oldimg_count));
	if(++number > max_oldimg_count) {
		number = 1;
	}
	oldimage_switch(number);	
}

function oldimage_switch(number) {
	if(window.oldimg_location == undefined)return;
	var image = document.getElementById("image-main");
	//image.setAttribute("title","Menn ad gera eitthvad");
	image.style.backgroundImage = "url('"+oldimg_location+oldimg_prefix+(number)+oldimg_suffix+"')";
	image.style.backgroundRepeat = "no-repeat";
	
}
function newimage_switch(number) {
	var image = document.getElementById("imagenew");
	image.style.backgroundImage = "url('"+newimg_location+newimg_prefix+(number)+newimg_suffix+"')";
	image.style.backgroundRepeat = "no-repeat";
}

function cookieStatusCheck() {
	return navigator.cookieEnabled;
}
function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}
function checkBrowserVersion() {
	var version = navigator.appVersion;
	alert("Version is "+version);
	if(version.match(/*MSIE*/)) {
		alert("Got MSIE 6");
	}else
		alert("Not MSIE6");
}

window.onload = init_image_switch;