function changeCSS(path)
{
    var head = document.getElementsByTagName('head')[0];
    var css = document.getElementById('css');
    
    if (css) {
        head.removeChild(css);
    }
    
    css = document.createElement('link');
    css.id = 'css';
    css.rel = 'stylesheet';
    css.media = 'screen';
    css.type = 'text/css';
    css.href = path;
    head.appendChild(css);
}

function changeThumbNail(obj)
{
    var dst = document.getElementById('big-img');
    
    if (!dst) {
        return;
    }
    
    var old = dst.src;
    
    dst.src = obj.src;
    
    obj.src = old;
    
    var htf = document.getElementById('thumbhref');
    
    hrf = dst.src;
    hrf = hrf.replace(/-big/, '-velky');
    
    htf.href = hrf;
}