function kontrol()
 {
    var oy_kul    = get_cookie("fnt_oy");
    
    if (oy_kul == "" || oy_kul == undefined || oy_kul == null)
    {
        set_cookie("fnt_oy","1",30);
        return true;
    }
    else
    {
        alert("Birden fazla oy kullanamazsınız.");
        return false;
    } 
 
    return false;
 }
 

function set_cookie(c_name,value,expiredays)
{
    var exdate = new Date();
    exdate.setDate(exdate.getDate() + expiredays);
    document.cookie = c_name+ "=" + escape(value) + ((expiredays==null) ? "" : ";expires=" + exdate.toGMTString() + ";path=/");
}

function get_cookie(c_name)
{
    if (document.cookie.length > 0)
    {
        c_start = document.cookie.indexOf(c_name + "=");
        if (c_start != -1)
        {
            c_start = c_start + c_name.length+1;
            c_end   = document.cookie.indexOf(";", c_start);
            
            if (c_end == -1) c_end = document.cookie.length;
            
            return unescape(document.cookie.substring(c_start, c_end));
        }
    }
    
    return "";
}