cookie

function setCookie(name, value, iDay)
{
    var oDate=new Date();
    oDate.setDate(oDate.getDate()+iDay);

    document.cookie=name+'='+value+';expires='+oDate;
}

function getCookie(name)
{
    var arr=document.cookie.split('; ');

    for(var i=0;i<arr.length;i++)
    {
        var arr2=arr[i].split('=');

        if(arr2[0]==name)
        {
            return arr2[1];
        }
    }

    return '';
}

function removeCookie(name)
{
    setCookie(name, 1, -1);
}