function preLoadx(){
	var header_1 = new Image();
	var header_2 = new Image();
	var header_3 = new Image();
	var header_4 = new Image();
	
	header_1.src = '/i/header_1.jpg';
	header_2.src = '/i/header_2.jpg';
	header_3.src = '/i/header_3.jpg';
	header_4.src = '/i/header_4.jpg';

	if(getCookie('turn') == 1){
	
		document.getElementById('iphone_tr').style.display = 'none';
		document.getElementById('yota_tr').style.display = 'block';		
		setCookie('turn', 2, "Mon, 01-Jan-2019 00:00:00 GMT", "/");		

	} else {
	
		document.getElementById('iphone_tr').style.display = 'block';
		document.getElementById('yota_tr').style.display = 'none';		
		setCookie('turn', 1, "Mon, 01-Jan-2019 00:00:00 GMT", "/");	
	
	}
	
	return;
}

function preLoad(){
	var header_1 = new Image();
	var header_2 = new Image();
	var header_3 = new Image();
	var header_4 = new Image();
	
	header_1.src = '/i/header_1.jpg';
	header_2.src = '/i/header_2.jpg';
	header_3.src = '/i/header_3.jpg';
	header_4.src = '/i/header_4.jpg';
	
	return;
}

function setCookie (name, value, expires, path, domain, secure) {
      document.cookie = name + "=" + escape(value) +
        ((expires) ? "; expires=" + expires : "") +
        ((path) ? "; path=" + path : "") +
        ((domain) ? "; domain=" + domain : "") +
        ((secure) ? "; secure" : "");
}

function getCookie(name) {
	var cookie = " " + document.cookie;
	var search = " " + name + "=";
	var setStr = null;
	var offset = 0;
	var end = 0;
	if (cookie.length > 0) {
		offset = cookie.indexOf(search);
		if (offset != -1) {
			offset += search.length;
			end = cookie.indexOf(";", offset)
			if (end == -1) {
				end = cookie.length;
			}
			setStr = unescape(cookie.substring(offset, end));
		}
	}
	return(setStr);
}