var imagesPreloaded = false;
function imagesPreload() 
{
	if (document.images) 
	{
		engineBtAviaoON			= new Image();
		engineBtAviaoON.src		= "/images/engine/engine_bt_aviao_on.gif";
		engineBtAviaoOFF		= new Image();
		engineBtAviaoOFF.src	= "/images/engine/engine_bt_aviao_off.gif";
		
		engineBtHotelON			= new Image();
		engineBtHotelON.src		= "/images/engine/engine_bt_hotel_on.gif";
		engineBtHotelOFF		= new Image();
		engineBtHotelOFF.src	= "/images/engine/engine_bt_hotel_off.gif";	

		engineBtCarON			= new Image();
		engineBtCarON.src		= "/images/engine/engine_bt_car_on.gif";
		engineBtCarOFF			= new Image();
		engineBtCarOFF.src		= "/images/engine/engine_bt_car_off.gif";	

	}
	imagesPreloaded = true;			
}	

if(imagesPreloaded == false) 
{
	imagesPreload();
}