function scrollToTop(){
	$(document).ready(function(){$(this).scrollTop(0);})
}

$("body").ready(function(){
	var t = new Date().getHours();
	var bgClass = "";
	if(t < 6 || t > 21){
		bgClass="night";
	} else if (t >= 6 && t < 10) {
		bgClass="dawn";
	} else if (t > 17 && t <= 21){
		bgClass="dusk";
	}

	$("body").addClass(bgClass);
});

$(".background").ready(function(){
	var posBGClouds = function() {
		var opos = $(".background.layer_3").css("background-position");
		var ox = opos.replace(/[^-0-9 ]/g,"");
		ox = parseInt(ox.substring(0,ox.indexOf(" ")));
		ox = ox==-1871?-1:ox-1;
		var npos = ox+"px"+ opos.substr(opos.indexOf(" "));
		$(".background.layer_3").css("background-position", npos);
		setTimeout(function(){posBGClouds();}, 100);
	}
	var posBGMountain = function() {
		sizeBG();
		var dh = $(document).height();
		var ww = $(window).width();
		var wh = $(window).height();
		var th = dh-wh;
		var wc = ww>1871?0:1871-ww;
		var hc = 80;
		var hr = th>0?$(document).scrollTop()/th:0;
		var bgx = Math.round(hr*wc)-wc;
		var bgy = wh-347;
		var bgpos = bgx + "px " + bgy + "px";
		$(".background.layer_2").css("background-position", bgpos);
	}
	var sizeBG = function() {
		if($(window).height() > $(".background.layer_2").height()){
			$(".background").height($(window).height());
		}
	}

	sizeBG();
	posBGClouds();
	posBGMountain();
	
	$(window).resize(function(){
		posBGMountain();
	});
	$(window).scroll(function(){
		posBGMountain();
	});
});