// modified from /store/js/mage/cookies.js
if (!window.Mage) var Mage = {};

Mage.Cookies = {};
Mage.Cookies.set = function(name, value){
     var argv = arguments;
     var argc = arguments.length;
     var expires = (argc > 2) ? argv[2] : null;
     var path = (argc > 3) ? argv[3] : '/';
     var domain = (argc > 4) ? argv[4] : null;
     var secure = (argc > 5) ? argv[5] : false;
     document.cookie = name + "=" + escape (value) +
       ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) +
       ((path == null) ? "" : ("; path=" + path)) +
       ((domain == null) ? "" : ("; domain=" + domain)) +
       ((secure == true) ? "; secure" : "");
};

Mage.Cookies.get = function(name){
    var arg = name + "=";
    var alen = arg.length;
    var clen = document.cookie.length;
    var i = 0;
    var j = 0;
    while(i < clen){
        j = i + alen;
        if (document.cookie.substring(i, j) == arg)
            return Mage.Cookies.getCookieVal(j);
        i = document.cookie.indexOf(" ", i) + 1;
        if(i == 0)
            break;
    }
    return null;
};

Mage.Cookies.clear = function(name) {
  if(Cookies.get(name)){
    document.cookie = name + "=" +
    "; expires=Thu, 01-Jan-70 00:00:01 GMT";
  }
};

Mage.Cookies.getCookieVal = function(offset){
   var endstr = document.cookie.indexOf(";", offset);
   if(endstr == -1){
       endstr = document.cookie.length;
   }
   return unescape(document.cookie.substring(offset, endstr));
};

var background = {
	names: null,
	init: function(data) {
		this.data = data;
		var i = Mage.Cookies.get("background");
		if (i == null || i < 0 || background.data.length <= i) {
			i = Math.floor(Math.random()*background.data.length);
		}
		this.set(i);
		var bg = this;
		$("backgrounds").getElementsBySelector("li > img").each(function(img, i) {
			Event.observe(img, 'mouseover', function (event) { 
				var img = this;
				if (i != Mage.Cookies.get("background"))
					img.writeAttribute("src", 
						"/sites/all/themes/airy/img/bg/"+
							img.readAttribute('name')+"_tn_selected.gif");
			});
			Event.observe(img, 'mouseout', function (event) { 
				var img = this;
				if (i != Mage.Cookies.get("background"))
					img.writeAttribute("src", 
						"/sites/all/themes/airy/img/bg/"+
							img.readAttribute('name')+"_tn.gif");
			});
			Event.observe(img, 'click', function (event) { bg.set(i); });
		});
	},
	set: function(i) {
		Mage.Cookies.set("background", i, null, '/');
		var data = this.data[i];
		$("header").setStyle({
			backgroundImage: "url(/sites/all/themes/airy/img/bg/"+data.name+"_top.jpg)",
			backgroundColor: data.bgcolor
		});
		var div = $("subhead-left");
		if (div) div = div.getElementsBySelector("img.background");
		if (div) div[0].writeAttribute("src",
				"/sites/all/themes/airy/img/bg/"+data.name+"_left_short.jpg");
		$("backgrounds").getElementsBySelector("li > img").each(function(img, j) {
			var name = img.readAttribute('name');
			if (i==j) {
				img.writeAttribute("src", 
					"/sites/all/themes/airy/img/bg/"+name+"_tn_active.gif");
			} else {
				img.writeAttribute("src", 
					"/sites/all/themes/airy/img/bg/"+name+"_tn.gif");
			}
		});
	}
};
document.observe("dom:loaded", function() { background.init(background_data); });