var imgNumber;
var prevImgNumber;
var forcedAction;
var bannersCount = 6;

function init()
{
    imgNumber = 1;
    prevImgNumber = bannersCount;
    nextImage();
}

function nextImage()
{
    checkImgNumber();
    //alert(imgNumber);

    hidid = 'slider' + prevImgNumber;
    var demt = document.getElementById(hidid);
    demt.className = "dn";

    divid = 'slider' + imgNumber;
    var emt = document.getElementById(divid);
    emt.className = "db";

    prevImgNumber = imgNumber;
    imgNumber = imgNumber + 1;

    if(forcedAction == true) {
        forcedAction = false;
    } else  rotimer = setTimeout("nextImage();", 10000);
}


function prevImage()
{
    /* shovat nynejsi slider[prevImgNumber] */
    hidid = 'slider' + prevImgNumber;
    var emt = document.getElementById(hidid);
    emt.className = "dn";

    prevPrevImgNumber = prevImgNumber - 1;
    if(prevPrevImgNumber < 1) prevPrevImgNumber = bannersCount;
    divid = 'slider' + prevPrevImgNumber;
    var demt = document.getElementById(divid);
    demt.className = "db";

    prevImgNumber = prevPrevImgNumber;
    imgNumber = prevPrevImgNumber + 1;

    if(forcedAction == true) {
        forcedAction = false;
    } else  rotimer = setTimeout("nextImage();", 10000);
}

function checkImgNumber()
{
    if(imgNumber > bannersCount) imgNumber = 1;
    if(imgNumber < 1) imgNumber = bannersCount;
}


function setForcedAction()
{
    forcedAction = true;
    clearTimeout(rotimer);
    rotimer = setTimeout("nextImage();", 10000);
}