function getHTTPObject()
{
  var xmlhttp;

  if(window.XMLHttpRequest)
  {
    xmlhttp = new XMLHttpRequest();
  }
  else if (window.ActiveXObject)
  {
    xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");

    if (!xmlhttp)
    {
      xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
    }
  }

  return xmlhttp;
}

var ajax = getHTTPObject();

var ajax_brands = getHTTPObject();
var ajax_categories = getHTTPObject();
var ajax_sizes = getHTTPObject();

function changeBrands(url)
{
  ajax_brands.abort();
  ajax_brands = getHTTPObject();

  ajax_brands.open("GET", url, true);
  ajax_brands.onreadystatechange = updateBrands;

  // Send the request
  ajax_brands.send(null);
}

function changeCategories(url)
{
  ajax_categories.abort();
  ajax_categories = getHTTPObject();

  ajax_categories.open("GET", url, true);
  ajax_categories.onreadystatechange = updateCategories;

  // Send the request
  ajax_categories.send(null);
}

function changeSizes(url)
{
  ajax_sizes.abort();
  ajax_sizes = getHTTPObject();

  ajax_sizes.open("GET", url, true);
  ajax_sizes.onreadystatechange = updateSizes;

  // Send the request
  ajax_sizes.send(null);
}

function updateBrands()
{
  if (ajax_brands.readyState == 4)
  {
    brandvalue = document.getElementById('quick_brand').value;
    var response = ajax_brands.responseText;
    document.getElementById('quick_brand_container').innerHTML = response;
    document.getElementById('quick_brand').value = brandvalue;
    document.getElementById('quick_brand').disabled = false;
    enableSize();
  }
}

function updateCategories()
{
  if (ajax_categories.readyState == 4)
  {
    departmentvalue = document.getElementById('quick_sub_category').value;
    var response = ajax_categories.responseText;
    document.getElementById('quick_sub_category_container').innerHTML = response;
    document.getElementById('quick_sub_category').value = departmentvalue;
    document.getElementById('quick_sub_category').disabled = false;
    enableSize();
  }
}

function updateSizes()
{
  if (ajax_sizes.readyState == 4)
  {
    sizevalue = document.getElementById('quick_size').value;
    var response = ajax_sizes.responseText;
    document.getElementById('quick_size_container').innerHTML = response;
    document.getElementById('quick_size').value = sizevalue;
    document.getElementById('quick_size').disabled = false;
    quickSave();
  }
}

function quickSave()
{
  var brandvalue = document.getElementById('quick_brand').value;
  var catvalue = document.getElementById('quick_category').value;
  var departmentvalue = document.getElementById('quick_sub_category').value;
  var sizevalue = document.getElementById('quick_size').value;
  var url = '/quick_save_ajax.php?category_id='+catvalue+'&manufacturer_id='+brandvalue+'&department_id='+departmentvalue+'&size_id='+sizevalue;
  ajax.abort();
  ajax = getHTTPObject();
  ajax.open("GET", url, true);

  // Send the request
  ajax.send(null);
}

function enableBrand(refresh)
{
  var brandvalue = document.getElementById('quick_brand').value;

  if (brandvalue == '' || refresh)
  {
    var catvalue = document.getElementById('quick_category').value;
    var departmentvalue = document.getElementById('quick_sub_category').value;
    var sizevalue = document.getElementById('quick_size').value;

    if (catvalue != '')
    {
      var url = '/brands_ajax.php?category_id='+catvalue+'&manufacturer_id='+brandvalue+'&department_id='+departmentvalue+'&size_id='+sizevalue;
      document.getElementById('quick_brand').disabled = true;
      changeBrands(url);
    }
    else
    {
      document.getElementById('quick_brand').value = '';
      document.getElementById('quick_brand').disabled = true;
    }
  }
}
function enableCategory(refresh)
{
  var departmentvalue = document.getElementById('quick_sub_category').value;

  if (departmentvalue == '' || refresh)
  {
    var catvalue = document.getElementById('quick_category').value;
    var brandvalue = document.getElementById('quick_brand').value;
    var sizevalue = document.getElementById('quick_size').value;

    if (catvalue != '')
    {
      var url = '/categories_ajax.php?category_id='+catvalue+'&manufacturer_id='+brandvalue+'&department_id='+departmentvalue+'&size_id='+sizevalue;
      document.getElementById('quick_sub_category').disabled = true;
      changeCategories(url);
    }
    else
    {
      document.getElementById('quick_sub_category').value = '';
      document.getElementById('quick_sub_category').disabled = true;
    }
  }
}
function enableSize()
{
  var catvalue = document.getElementById('quick_category').value;
  var brandvalue = document.getElementById('quick_brand').value;
  var departmentvalue = document.getElementById('quick_sub_category').value;
  var sizevalue = document.getElementById('quick_size').value;

  if (catvalue != '' && departmentvalue != '')
  {
    var url = '/sizes_ajax.php?category_id='+catvalue+'&manufacturer_id='+brandvalue+'&department_id='+departmentvalue+'&size_id='+sizevalue;
    document.getElementById('quick_size').disabled = true;
    changeSizes(url);
  }
  else
  {
    document.getElementById('quick_size').value = '';
    document.getElementById('quick_size').disabled = true;
    quickSave();
  }
}

var currentUrl = "";
var targetdiv = "";

function changePage(url, target)
{
  ajax.abort();
  ajax = getHTTPObject();

  targetdiv = target;

  ajax.open("GET", url, true);
  ajax.onreadystatechange = updatePage;

  // Send the request
  ajax.send(null);
}

function updatePage()
{
  if (ajax.readyState == 4)
  {
    var response = ajax.responseText;
    document.getElementById(targetdiv).innerHTML = response;

    var script = /<div \b.*?>([\s\S]*?)<\/div>/ig;
    var match;

    while (match = script.exec(response))
    {
      if(match)
      {
        //alert(match[1]);
        if(match[1].indexOf("<script") == -1 && match[1].indexOf("SymError") == -1)
        {
          try {
            eval(match[1]);
          }
          catch (err) {
            //alert(eval(match[1]));
          }
        }
      }
    }

    //match any scripts in the response and eval them
    var script = /<script\b.*?>([\s\S]*?)<\/script>/ig;
    var match;

    while (match = script.exec(response))
    {
      if(match)
      {
        //alert(match[1]);
        if(match[1].indexOf("<script") == -1 && match[1].indexOf("SymError") == -1)
        {
          try {
            eval(match[1]);
          }
          catch (err) {
            //alert(eval(match[1]));
          }
        }
      }
    }
  }
}

function GetOptions(target, url)
{
   if(document.getElementById('parent_product').value != "")
   {
     var product = document.getElementById('parent_product').value;
   }
   else
   {
     var product = document.getElementById('product').value;
   }

   var urlstring = '';

   for(i=0;i<document.getElementById('productform').elements.length;i++)
   {
     formitem = document.getElementById('productform').elements[i];
     if(formitem.value != '' & formitem.name != 'product_id')
     {
        urlstring += '&' + formitem.name + '='
                      + formitem.value
     }
   }
   url = url + '?' + 'product=' + product.value + urlstring;
   changePage(url, target);
}