var imgLoaded = false;
if ( ! window.location.origin){
    window.location.origin = window.location.protocol+"//"+window.location.host+"/";
} 

function nextItem(id) {
    imgLoaded = false;
    var i = 0;
    if(typeof id == 'undefined'){
        id = 0;
    }
    var tmpId = 0;
    var found = 0;
    for(i in lista) {
        if(id == 0){
            found = 1;
            id = lista[i].id_web_contents;
            break;
        }else if(tmpId == id){
            found = 1;
            id = lista[i].id_web_contents;
            break;
        }else{
            tmpId = lista[i].id_web_contents;
            continue;
        }
    }
    if(!found) {
        nextItem(0);
        return null;
    }
    var imgSrc = '/upload/oferta_'+id+'.jpg';
    IsValidImageUrl(imgSrc);
    if($('#ofertaFrame').css('background-image') == 'url('+window.location.origin+imgSrc+')'){
        nextItem(id);
    }else{
        $('#ofertaContent').fadeOut(1000);
        $('#ofertaTitle').fadeOut(1000, function() {
            $('.ofertaKolko').each(function(){
                $(this).removeClass('ofertaKolkoActive')
            })
            var nrKolka = i*1 + 1;
            $('#o'+nrKolka).addClass('ofertaKolkoActive');
            $('#ofertaTitle').html(lista[i].title);
            $('#ofertaContent').html(lista[i].content);
            $('#ofertaFrame').css('background', 'url('+imgSrc+') no-repeat 11px 23px');
            if(imgLoaded){
                $('#ofertaFrame').fadeIn( 1000);
            }else{
                $('#ofertaFrame').css('display', 'none');
            }
            $('#ofertaContent').fadeIn(1000);
            $('#ofertaTitle').fadeIn(1000, function() {
                setTimeout('nextItem('+id+')',4500);
            });
        });
    }
}

function IsValidImageUrl(url) {
    $("<img>", {
        src: url,
        error: function() {
            imgLoaded = false;;
        },
        load: function() {
            imgLoaded = true;
        }
    });
}