function setImageOff(image)
{
    var prefix = "images/v4/";
    var image_source = image.src;
    var image_index = image_source.indexOf(prefix);
    if(image_index != -1){
        image_source = image_source.substring(image_index + prefix.length);
    }

    var start_index = image_source.indexOf('Over');
    var new_source = image_source.substring(0, start_index);

    new_source = prefix + new_source +"OFF"+ image_source.substring(image_source.indexOf("."));

    image.src = new_source;

    image.style.cursor = "normal";
}

function setImageActive(image)
{
    var prefix = "images/v4/";
    var image_source = image.src;
    var image_index = image_source.indexOf(prefix);
    if(image_index != -1){
        image_source = image_source.substring(image_index + prefix.length);
    }

    var start_index = image_source.indexOf('OFF');

    var new_source = image_source.substring(0, start_index);
    new_source = prefix + new_source +"Over"+ image_source.substring(image_source.indexOf("."));
    image.src = new_source;

    image.style.cursor = "pointer";
}