function sfMediaLibrary_Engine()
{
  // Browser check
  var ua = navigator.userAgent;
  this.isMSIE = (navigator.appName == "Microsoft Internet Explorer");
  this.isMSIE5 = this.isMSIE && (ua.indexOf('MSIE 5') != -1);
  this.isMSIE5_0 = this.isMSIE && (ua.indexOf('MSIE 5.0') != -1);
  this.isGecko = ua.indexOf('Gecko') != -1;
  this.isSafari = ua.indexOf('Safari') != -1;
  this.isOpera = ua.indexOf('Opera') != -1;
  this.isMac = ua.indexOf('Mac') != -1;
  this.isNS7 = ua.indexOf('Netscape/7') != -1;
  this.isNS71 = ua.indexOf('Netscape/7.1') != -1;

  // Fake MSIE on Opera and if Opera fakes IE, Gecko or Safari cancel those
  if (this.isOpera) {
    this.isMSIE = true;
    this.isGecko = false;
    this.isSafari =  false;
  }
}

sfMediaLibrary_Engine.prototype = {
  init : function(url)
  {
    this.url = url;
  },

  fileBrowserReturn : function (url, tinyMCEPopup)
  {
    if (tinyMCEPopup) {
      var win   = tinyMCEPopup.getWindowArg("window");
      var input = tinyMCEPopup.getWindowArg("input");
      win.document.getElementById(input).value = url;

      if (this.fileBrowserType == 'image') {
        if (win.ImageDialog.showPreviewImage) {
          win.ImageDialog.showPreviewImage(url);
        }
      }

      tinyMCEPopup.close();
    } else {
      this.fileBrowserWin.document.forms[this.fileBrowserFormName].elements[this.fileBrowserFieldName].value = url;
      this.win.close();
    }
  },

  fileBrowserCallBack : function (field_name, url, type, win)
  {
    var url = this.url + '/tinyMCE/1';

    if (type == 'image')
      url += '/images_only/1';

    this.fileBrowserWin = win;
    this.fileBrowserFormName = 0;
    this.fileBrowserFieldName = field_name;
    this.fileBrowserType = type;

    tinyMCE.activeEditor.windowManager.open({
        file: url
      , width: 640
      , height: 480
      , resizable: "no"
      , inline: "yes"
      , scrollbars: "no"
      , close_previous: "yes"
    } , {
        window: win
      , input: field_name
      , mediaLibrary: this
    });

    return false;
  },

  openWindow : function(options)
  {
    var width, height, x, y, resizable, scrollbars, url;

    if (!options)
      return;
    if (!options['field_name'])
      return;
    if (!options['url'] && !this.url)
      return;

    this.fileBrowserWin = self;
    this.fileBrowserFormName = (options['form_name'] != '') ? options['form_name'] : 0;
    this.fileBrowserFieldName = options['field_name'];
    this.fileBrowserType = options['type'];

    url = this.url;
    if (options['type'] == 'image')
      url += '/images_only/1';

    if (options['reset_tinymce'] == '1')
      url += '/reset_tinymce/1';

    if (options['dir'])
      url += '/dir/' + options['dir'];

    if (options['multiple_selection'])
      url += '/multiple_selection/' + options['multiple_selection'];

    if (!(width = parseInt(options['width'])))
      width = 640;

    if (!(height = parseInt(options['height'])))
      height = 480;

    // Add to height in M$ due to SP2 WHY DON'T YOU GUYS IMPLEMENT innerWidth of windows!!
    if (sfMediaLibrary.isMSIE)
      height += 40;
    else
      height += 20;

    x = parseInt(screen.width / 2.0) - (width / 2.0);
    y = parseInt(screen.height / 2.0) - (height / 2.0);

    resizable = (options && options['resizable']) ? options['resizable'] : "no";
    scrollbars = (options && options['scrollbars']) ? options['scrollbars'] : "no";

    var modal = (resizable == "yes") ? "no" : "yes";

    if (sfMediaLibrary.isGecko && sfMediaLibrary.isMac)
      modal = "no";

    if ( sfMediaLibrary.lastWindow && options['close_previous'] != "no" )
      try {sfMediaLibrary.lastWindow.close();} catch (ex) {}

    var win = window.open(url, "sfPopup" + new Date().getTime(), "top=" + y + ",left=" + x + ",scrollbars=" + scrollbars + ",dialog=" + modal + ",minimizable=" + resizable + ",modal=" + modal + ",width=" + width + ",height=" + height + ",resizable=" + resizable);

    if ( options['close_previous'] != "no" )
      sfMediaLibrary.lastWindow = win;

    eval('try { win.resizeTo(width, height); } catch(e) { }');

    // Make it bigger if statusbar is forced
    if (sfMediaLibrary.isGecko) {
      if (win.document.defaultView.statusbar.visible)
        win.resizeBy(0, sfMediaLibrary.isMac ? 10 : 24);
    }

    win.focus();
    this.win = win;
  }
}

var SfMediaLibrary = sfMediaLibrary_Engine; // Compatiblity with gzip compressors
var sfMediaLibrary = new sfMediaLibrary_Engine();