function reply(parent_id) {
var res = document.getElementById('parent_id');
res.value = parent_id;
}

function hide_show()
{

var full = document.getElementsByClassName("fulltext");

var vis = full[0].style.display;

var but = document.getElementsByClassName("but");

if(vis == 'none')
{
vis = 'block';
but[0].innerHTML = '<h3>Свернуть</h3>';
}
else
{
vis = 'none';
but[0].innerHTML = '<h3>Добавить комментарий</h3>';
}

full[0].style.display = vis;

}