function popin(divname, divnumber, totaldivs) {
    for (var i = 1; i <= totaldivs; i++) {
        document.getElementById(divname + i).style.display = 'none';
    }
    document.getElementById(divname + divnumber).style.display = 'block';
}

function popout(divname, divnumber, totaldivs) {
    for (var i = 1; i <= totaldivs; i++) {
        document.getElementById(divname + i).style.display = 'none';
    }
    if (divnumber != 0) {
        document.getElementById(divname + divnumber).style.display = 'block';
    }
}

function rotateimages(index) {
    var noofimages = 6;
    for (var i = 1; i <= noofimages; i++) {
        document.getElementById('big' + i).style.display = 'none';
    }
    document.getElementById('big' + index).style.display = 'block';
    if (index == noofimages) {
        index = 1;
    } else {
        index += 1;
    }
    setTimeout('rotateimages(' + index + ')', 7000);
}