function swapImg(id,img)
{
	if( document.getElementById)
	{
		obj	= document.getElementById(id);
		obj.setAttribute( 'src', img );
	}
}
//-------------------------------------------------------------------------------------------------------
//	Better Image swap (functions cross browser without adding ID tag)
//-------------------------------------------------------------------------------------------------------
function roll_over(img_name, img_src)
   {
   document[img_name].src = img_src;
   } 

//---------------------------------------------------------------------------------------------------------
//	Show Subnav
//---------------------------------------------------------------------------------------------------------
var selectedID = 0;

function showSubnav(what)
{
	//	Hide existing one
	if (selectedID)
	{
		hideSubnav();	
	}
	
	Subnavobject						= document.getElementById('Subnav' + what);
	Subnavobject.style.display			= ''; 
	selectedID							= what;
}

function hideSubnav()
{
	if (selectedID)
	{
		selectedobject					= document.getElementById('Subnav' + selectedID);
		selectedobject.style.display = 'none'; 
		selectedID						= 0;
	}
}

//---------------------------------------------------------------------------------------------------------
//	Show Aircraft
//---------------------------------------------------------------------------------------------------------
var selectedID = 0;

function showAircraft(what)
{
	//	Hide existing one
	if (selectedID)
	{
		hideAircraft();	
	}
	
	Aircraftobject						= document.getElementById('aircraft' + what);
	Aircraftobject.style.display		= ''; 
	selectedID							= what;
}

function hideAircraft()
{
	if (selectedID)
	{
		selectedobject					= document.getElementById('aircraft' + selectedID);
		selectedobject.style.display = 'none'; 
		selectedID						= 0;
	}
}

//---------------------------------------------------------------------------------------------------------
//	Show safety
//---------------------------------------------------------------------------------------------------------
var selectedID = 0;

function showsafety(what)
{
	//	Hide existing one
	if (selectedID)
	{
		hidesafety();	
	}
	
	safetyobject						= document.getElementById('safety' + what);
	safetyobject.style.display			= ''; 
	selectedID							= what;
}

function hidesafety()
{
	if (selectedID)
	{
		selectedobject					= document.getElementById('safety' + selectedID);
		selectedobject.style.display = 'none'; 
		selectedID						= 0;
	}
}

//---------------------------------------------------------------------------------------------------------
//	Show home
//---------------------------------------------------------------------------------------------------------
var selectedID = 0;

function showhome(what)
{
	//	Hide existing one
	if (selectedID)
	{
		hidehome();	
	}
	
	homeobject							= document.getElementById('home' + what);
	homeobject.style.display			= ''; 
	selectedID							= what;
}

function hidehome()
{
	if (selectedID)
	{
		selectedobject					= document.getElementById('home' + selectedID);
		selectedobject.style.display = 'none'; 
		selectedID						= 0;
	}
}