function $(id)
{
  return document.getElementById(id);
}

// Searches the blog based on the entered text and
// searches comments as well if chosen.
function Search(root)
{
  var input = $("searchfield");
  var check = $("searchcomments");
  
  var search = "search.aspx?q=" + encodeURIComponent(input.value);
  if (check != null && check.checked)
    search += "&comment=true";
  
  top.location.href = root + search;
  
  return false;
}

// Clears the search fields on focus.
function SearchClear(defaultText)
{
  var input = $("searchfield");
  if (input.value == defaultText)
    input.value = "";
  else if (input.value == "")
    input.value = defaultText;
}

function Rate(id, rating)
{
  CreateCallback("/rating.axd?id=" + id + "&rating=" + rating, RatingCallback);
}

function RatingCallback(response)
{
  var rating = response.substring(0, 1);
  var status = response.substring(1);
  
  if (status == "OK")
  {
    if (typeof OnRating != "undefined")
      OnRating(rating);
    
    alert("Deine Bewertung wurde gespeichert, Danke!");
  }  
  else if (status == "HASRATED")
  {
    alert("Der Beitrag wurde von Ihnen bereits bewertet.");
  }
  else
  {
    alert("Bei der Registrierung Ihrer Bewertung trat ein Fehler auf, bitte versuchen Sie es später nocheinmal.");
  }    
}

/// <summary>
/// Creates a client callback back to the requesting page
/// and calls the callback method with the response as parameter.
/// </summary>
function CreateCallback(url, callback)
{
  var http = GetHttpObject();
  http.open("GET", url, true);
  
  http.onreadystatechange = function() 
  {
	  if (http.readyState == 4) 
	  {
	    if (http.responseText.length > 0 && callback != null)
        callback(http.responseText);
	  }
  }
  
  http.send(null);
}

/// <summary>
/// Creates a XmlHttpRequest object.
/// </summary>
function GetHttpObject() 
{
    if (typeof XMLHttpRequest != 'undefined')
        return new XMLHttpRequest();
    
    try 
    {
        return new ActiveXObject("Msxml2.XMLHTTP");
    } 
    catch (e) 
    {
        try 
        {
            return new ActiveXObject("Microsoft.XMLHTTP");
        } 
        catch (e) {}
    }
    
    return false;
}