function rolltextarea(obj, zwi, roz)
{
    var parent = obj.parentNode;
    var ta = parent.getElementsByTagName('textarea');
    var t = ta[0];
    var div = parent.getElementsByTagName('div');
    var d = div[0];
    
    if (t.style.display == 'none')
    {
        t.style.display = ''; 
        d.innerHTML = d.innerHTML.replace(zwi, roz);
    }
    else
    {
        t.style.display = 'none';
        d.innerHTML = d.innerHTML.replace(roz, zwi);
    }
}