function collapseThread( theId ) {
  var comment = document.getElementById(theId);
  if(!comment)
  {
    alert("ERROR:\nThe document structure is different\nfrom what Threaded Comments expects.\nYou are missing the element '"+theId+"'");
    return;
  }
  var theBody = findBody(comment);
  if(comment.className.indexOf("collapsed") > -1) {
    comment.className = comment.className.replace(" collapsed", "");;
  } else {
    comment.className += " collapsed";
  }
}

function expandThread( theId ) {
  var comment = document.getElementById(theId);
  if(!comment)
  {
    alert("ERROR:\nThe document structure is different\nfrom what Threaded Comments expects.\nYou are missing the element '"+theId+"'");
    return;
  }
  var theBody = findBody(comment);
  if(comment.className.indexOf("collapsed") > -1) {
    comment.className = comment.className.replace(" collapsed", "");;
  } 
}

function findBody(el)
{
  var divs = el.getElementsByTagName("div");
  var ret;
  for(var i = 0; i < divs.length; ++i) {
    if(divs.item(i).className.indexOf("body") > -1)
      return divs.item(i);
  }
  return false;
}

function onAddComment() {
  //checkDocumentIntegrity();

  var sAuthor = document.getElementById("author").value;
  if (sAuthor.length < 2) {
    alert('You must a valid name (greater than one character)');
    return;
  }
  var sEmail = document.getElementById("email").value;
  if ((sEmail.length < 5) || (sEmail.indexOf('@') < 2)) {
    alert('You must a valid email address');
    return;
  }
  var sComment = document.getElementById("comment").value;
  if (sComment.length < 2) {
    alert('You must enter a comment.');
    return;
  }

  var el = document.getElementById("commentform");
  // Future release: Check if form is filled correctly and mark the form fields.
  el.submit();
}

function moveAddCommentBelow(theId, threadId, collapse)
{
  expandThread( theId );
  var addComment = document.getElementById("addcomment");
  if(!addComment)
  {
      alert("ERROR:\nThreaded Comments can't find the 'addcomment' div.\nThis is probably because you have changed\nthe comments.php file.\nMake sure there is a tag around the form\nthat has the id 'addcomment'"); 
    return
  }
  var comment = document.getElementById(theId);
  if(collapse)
  {
    for(var i = 0; i < comment.childNodes.length; ++i) {
      var c = comment.childNodes.item(i);
      if(typeof(c.className) == "string" && c.className.indexOf("collapsed")<0) {
        c.className += " collapsed";
      }
    }
  }
  addComment.parentNode.removeChild(addComment);

  comment.appendChild(addComment);
  if(comment.className.indexOf("alt")>-1) {
    addComment.className = addComment.className.replace(" alt", "");          
  } else {
    addComment.className += " alt";
  }
  var replyId = document.getElementById("comment_reply_ID");
  if(replyId == null)
  {
    alert("Threaded Comments Error:\nThere is no hidden form field called\n'comment_reply_ID'. Please fix this before using the forms.");
  }
  replyId.value = threadId;
  var reRootElement = document.getElementById("reroot");
  if(reRootElement == null)
  {
    alert("Threaded Comments Error:\nThere is no anchor tag called 'reroot' where\nthe comment form starts.\nPlease fix this.");
  }
  reRootElement.style.display = "block";
  var aTags = comment.getElementsByTagName("A");
  var anc = aTags.item(0).id;
  //document.location.href = "#"+anc;
  document.getElementById("author").focus();
}

function checkDocumentIntegrity()
{
  str = "";
  
  str += checkElement("reroot","div tag");
  str += checkElement("addcomment", "div tag");
  str += checkElement("comment_reply_ID", "hidden form field");
  str += checkElement("content", "div tag");
  str += checkElement("comment", "textfield");
  str += checkElement("addcommentanchor", "anchor tag");
  
  if(str != "")
  {
    str = "Some of the comment elements are missing.\n\nThese are the errors:\n" + str;
    str += "\nYou should fix these before using the forms.";

    alert(str);
  }
}
           
function checkElement(theId, elDesc)
{
  var el = document.getElementById(theId);
  if(!el)
  {
    if(elDesc == null)
      elDesc = "element";
    return "- The "+elDesc+" with the ID '" +theId + "' is missing\n"; 
  }
  else 
    return "";
}

function reRoot()
{
  var addComment = document.getElementById("addcomment");      
  var reRootElement = document.getElementById("reroot");
  reRootElement.style.display = "none";
  var content = document.getElementById("content-main");
  if( !content )
    content = document.getElementById("content");
  if( content )
  {
    addComment.parentNode.removeChild(addComment);
    content.appendChild(addComment);
  }
  addComment.className = addComment.className.replace(" alt", "");
  document.location.href = "#addcommentanchor";
  document.getElementById("author").focus();        
  document.getElementById("comment_reply_ID").value = "0";
}      

function changeCommentSize(d)
{
  var el = document.getElementById("comment");
  var height = parseInt(el.style.height);
  if(!height && el.offsetHeight)
    height = el.offsetHeight;
  height += d;
  if(height < 20) 
    height = 20;
  el.style.height = height+"px";
}