var newImgName = "chair_thumbs";


function chooseImg(name) {
	newImgName = name;
	var router = getCookie('imgNum');
	
	if (router == 1) {
		setCookie('imgNum',2,1);
		replaceImg(2);
	} else {
		setCookie('imgNum',1,1);
		replaceImg(1);
	}
}

function setCookie(name, value, days) {
    if(days) {
        var date = new Date();
        date.setTime(date.getTime() + (days*24*60*60*1000));
        var expires = "; expires=" + date.toGMTString();
    } else {
        expires = "";
    }

	document.cookie = name + "=" + value + expires + "; path=/";
}

function getCookie(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 "0";
}

function replaceImg(n) {
	newSrc = "images/" + newImgName + n + ".jpg";
	document[newImgName].src = newSrc;
}