function togglemenu_port()
	{
		if(portmenu == true)
		{
			document.getElementById("portmenu").style.display = "";
			portmenu = false;
		}
		else
		{
			document.getElementById("portmenu").style.display = "none";
			portmenu = true;
		}
	}
	
	function togglemenu_defence()
	{
		if(defencemenu == true)
		{
			document.getElementById("defencemenu").style.display = "";
			defencemenu = false;
		}
		else
		{
			document.getElementById("defencemenu").style.display = "none";
			defencemenu = true;
		}
	}	
	function togglemenu_machinery()
	{
		if(machinerymenu == true)
		{
			document.getElementById("machinerymenu").style.display = "";
			machinerymenu = false;
		}
		else
		{
			document.getElementById("machinerymenu").style.display = "none";
			machinerymenu = true;
		}
	}	
	function togglemenu_cargo()
	{
		if(cargomenu == true)
		{
			document.getElementById("cargomenu").style.display = "";
			cargomenu = false;
		}
		else
		{
			document.getElementById("cargomenu").style.display = "none";
			cargomenu = true;
		}
	}
	function togglemenu_shipnet()
	{
		if(shipnetmenu == true)
		{
			document.getElementById("shipnetmenu").style.display = "";
			shipnetmenu = false;
		}
		else
		{
			document.getElementById("shipnetmenu").style.display = "none";
			shipnetmenu = true;
		}
	}
	function togglemenu_surveyors()
	{
		if(surveyorsmenu == true)
		{
			document.getElementById("surveyorsmenu").style.display = "";
			surveyorsmenu = false;
		}
		else
		{
			document.getElementById("surveyorsmenu").style.display = "none";
			surveyorsmenu = true;
		}
	}
	function togglemenu_depots()
	{
		if(depotsmenu == true)
		{
			document.getElementById("depotsmenu").style.display = "";
			depotsmenu = false;
		}
		else
		{
			document.getElementById("depotsmenu").style.display = "none";
			depotsmenu = true;
		}
	}	
	function togglemenu_liner()
	{
		if(linermenu == true)
		{
			document.getElementById("linermenu").style.display = "";
			linermenu = false;
		}
		else
		{
			document.getElementById("linermenu").style.display = "none";
			linermenu = true;
		}
	}	
	function togglemenu_offshore()
	{
		if(offshoremenu == true)
		{
			document.getElementById("offshoremenu").style.display = "";
			offshoremenu = false;
		}
		else
		{
			document.getElementById("offshoremenu").style.display = "none";
			offshoremenu = true;
		}
	}	
	function togglemenu_human()
	{
		if(humanmenu == true)
		{
			document.getElementById("humanmenu").style.display = "";
			humanmenu = false;
		}
		else
		{
			document.getElementById("humanmenu").style.display = "none";
			humanmenu = true;
		}
	}	
	
	togglemenu_port();
	togglemenu_defence();
	togglemenu_machinery();
	togglemenu_cargo();
	togglemenu_shipnet();
	togglemenu_surveyors();
	togglemenu_depots();
	togglemenu_liner();
	togglemenu_offshore();
	togglemenu_human();