var ie4 = (document.all && !document.getElementById);
var ie5 = (document.all && document.getElementById);
var ns6 = (!document.all && document.getElementById);

function element(id)
{
	if(ie5)			// Explorer 5+
		return document.getElementById(id);
	else if (ns6) 	// Netscape 6+ and Mozilla
	{	if (id == "TNTCtrl")
			id += "XP";
		return document.getElementById(id);
	}
	else if(ie4)	// Explorer 4
		return document.all[id];
	return null;
}

function TNTDoCommand(string)
{
	var control = element("TNTCtrl");
	if(control && control.ready)
		return control.TNTDoCommand(string);
	return "";
}

function doCommand()
{
	var retval = TNTDoCommand( element("doCommandEdit").value );
	if(retval)
		element("returnval").innerHTML = 'Return Value = "' + retval + '"';
	else
		element("returnval").innerHTML = "";
}

function onDoCommandKeypress()
{
	if(window.event.keyCode==13) // if return key was pressed
		doCommand();
}

function OnReady()
{
	element("TNTCtrl").focus();
	// load textures marked as external with their default textures
	var texcnt = 0;
	texcnt = TNTDoCommand('SceneGraph.GetBitmapCount()');
	var bExternal = 64;
	var bHasAlpha = 32;
	for( var i=0; i<texcnt; i++ )
	{
		var props = 0;
		props = TNTDoCommand('SceneGraph.Bitmap(' + i + ').GetProperties()');
		if(props & bExternal)
		{
			var name = TNTDoCommand('SceneGraph.Bitmap(' + i + ').GetName()');
			if(props & bHasAlpha)
			{
				name += '.png'; // alpha textures are exported as png
			}
			else
			{
				name += '.jpg'; // non-alpha textures are exported as jpg
			}
			TNTDoCommand('SceneGraph.Bitmap(' + i + ').Load("' + name + '")');
		}
	}
	window.status = "TurnTool Ready";
}