var BrowserDetect = 
  {
  init: function () 
    {
    this.browser = this.searchString  (this.dataBrowser)    || "an unknown browser";
    this.version = this.searchVersion (navigator.userAgent) || this.searchVersion(navigator.appVersion) || "an unknown version";
    this.OS      = this.searchString  (this.dataOS)         || "an unknown OS";
    },

  searchString: function (data) 
    {
	  for (var i = 0;i<data.length;i++)	{
	    var dataString = data[i].string;
	    var dataProp   = data[i].prop;
	    this.versionSearchString = data[i].versionSearch || data[i].identity;
	    if (dataString) 
	      {
	      if (dataString.indexOf(data[i].subString) != -1)
	        return data[i].identity;
	      }
	    else if (dataProp)
	      return data[i].identity;
	    }
    },

  searchVersion: function (dataString) 
    {
    var index = dataString.indexOf(this.versionSearchString);
    if (index == -1) return;
    return parseFloat(dataString.substring(index+this.versionSearchString.length+1));
    },

  dataBrowser: 
    [
	  { string: navigator.userAgent, subString: "OmniWeb", versionSearch: "OmniWeb/", identity: "OmniWeb" },
	  { string: navigator.vendor,    subString: "Apple",                              identity: "Safari" },
	  { prop: window.opera,                                                           identity: "Opera" },
	  { string: navigator.vendor, subString: "iCab",                                  identity: "iCab" },
	  { string: navigator.vendor, subString: "KDE",                                   identity: "Konqueror" },
	  { string: navigator.userAgent, subString: "Firefox",                            identity: "Firefox" },
	  { string: navigator.vendor, subString: "Camino",                                identity: "Camino" },
	  { string: navigator.userAgent, subString: "Netscape",                           identity: "Netscape" },
	  { string: navigator.userAgent, subString: "MSIE", versionSearch: "MSIE",        identity: "Explorer"  },	
	  { string: navigator.userAgent, subString: "Gecko", identity: "Mozilla", versionSearch: "rv" },
		{ string: navigator.userAgent, subString: "Mozilla", identity: "Netscape", versionSearch: "Mozilla" }
    ],

  dataOS : 
    [
	  { string: navigator.platform, subString: "Win", identity: "Windows" },
	  { string: navigator.platform, subString: "Mac", identity: "Mac" },
	  { string: navigator.platform, subString: "Linux", identity: "Linux" }
    ]
 };

BrowserDetect.init ();


function viewerElement ()
  {
  var element = null;
  
  if ((BrowserDetect.browser == "Explorer" || BrowserDetect.browser == "Safari"))
    {
    element = document.getElementById ("ImageViewer_object");
    }
  else
  	{
    element = document.getElementById ("ImageViewer_embed");	
  	}
  
  return element;
  }