var cortonabuild = 0;
	var goodns = false;
	var goodns67 = false;
	var goodie = false;
	if (navigator.appName.indexOf("Netscape") != -1)
	{
		var is_major = parseInt(navigator.appVersion);
    	var is_minor = parseFloat(navigator.appVersion);
		if (is_major == 6 && is_minor == 7)
		{
			goodns67 = true;
		}
		else
		{
			goodns = true;
		}
	}
	else if (navigator.appName.indexOf("Microsoft") != -1)
	{
		goodie = true;
	}	


function complete()
{
	navigator.plugins.refresh(true);
	if (goodns) installed();

	if (cortonabuild < 93) //because when upgrade, plugins collection will not be refreshed.
		alert('Cortona(R) VRML Client 4.2 installed. Please, restart your browser');
	else window.location.reload();
}

	
function installed()
{
	f = false; 
   	for (i = 0; i < navigator.plugins.length; i++)
   	{
    	pl = navigator.plugins[i];
		for (j = 0; j < pl.length; j++)
	  	{
    	 	mime = pl[j];
	    	if (mime.type.indexOf('vrml') != -1 && 
    	    	mime.suffixes.toLowerCase().indexOf('wrl') != -1 &&
	        	mime.enabledPlugin.name == pl.name &&
		        pl.name.toLowerCase().indexOf('cortona') != -1)
			{
				cortonaversion = pl.description.substring(pl.description.indexOf("(") + 1, pl.description.indexOf(")"));
				if (!cortonaversion.length)
				{
					cortonaversion = "2.2 or lower";
					cortonabuild = 41;
				}
				else
				{
					cortonabuild = cortonaversion.substring(cortonaversion.lastIndexOf(" "), cortonaversion.length);
				}
				f = true; break;
			}
		}
		if (f) break; 
	}
	return f;
}

function install_cortona()
{
	if (navigator.javaEnabled())
	{
		trigger = netscape.softupdate.Trigger;
		if (trigger.UpdateEnabled())
		{
			if (navigator.platform == "Win32")
   			{
				vi = new netscape.softupdate.VersionInfo(4,2,0,93);
				if (0 <= trigger.CompareVersion("/ParallelGraphics/Cortona/Vrml", vi))
					complete();
				else
					navigator.on_load_cortvrml = new Function("complete();");
				path = 'http://www.parallelgraphics.com' + '/bin';
				trigger.ConditionalSoftwareUpdate(path + '/cortvrml.jar',	"/ParallelGraphics/Cortona/Vrml",
					vi, trigger.DEFAULT_MODE);
			}
			else
			{
				alert("This plug-in only runs on Windows NT/95.")
			}
		}
		else
		{
			alert("Enable SmartUpdate before running this script.");
		}
	}
	else
	{
		alert("Enable Java before running this script.");
	}
}


function downloadNow ()
{
	if (navigator.platform=='Win32')
	{
		if (InstallTrigger.UpdateEnabled())
		{
			if (InstallTrigger.CompareVersion('/ParallelGraphics/Cortona/Vrml', 4,2,0,93) < 0)
			{
				InstallTrigger.install(
				{'Cortona VRML Client' : 'http://www.parallelgraphics.com/bin/cortvrml.xpi'}, 
				on_load_cortvrml );
			}
			else
				alert('Cortona has already installed.');
		}
		else
			alert('Enable Software Installation before running this script.');
	}
	else
		alert('This plug-in only runs on Windows operating systems.');
}


function on_load_cortvrml(url, status)
{
   var msg;
   switch( status )
   {
   case 0:
      msg =  'Cortona has been successfully installed.';
      break;
   case 999:
      msg =  'Please restart the browser to complete Cortona installation.';
      break;
   case -210:
      msg =  'Cortona installation has been canceled by user.';
      break;
   default:
      msg =  'Cortona installation has failed. Error code: ' + status;
   }
   alert(msg);
}