function togglemenu_port()
	{
		if(portmenu == true)
		{
			document.getElementById("portmenu").style.display = "";
			portmenu = false;
			document.getElementById("defencemenu").style.display = "none";
			defencemenu = true;
			document.getElementById("machinerymenu").style.display = "none";
			machinerymenu = true;
			document.getElementById("cargomenu").style.display = "none";
			cargomenu = true;
			document.getElementById("arupmenu").style.display = "none";
			arupmenu = true;
			
		}
		else
		{
			document.getElementById("portmenu").style.display = "none";
			portmenu = true;
			
		}
	}
	
	function togglemenu_defence()
	{
		if(defencemenu == true)
		{
			document.getElementById("portmenu").style.display = "none";
			portmenu = true;
			document.getElementById("defencemenu").style.display = "";
			defencemenu = false;
			document.getElementById("machinerymenu").style.display = "none";
			machinerymenu = true;
			document.getElementById("cargomenu").style.display = "none";
			cargomenu = true;
			document.getElementById("arupmenu").style.display = "none";
			arupmenu = true;
			
				
		}
		else
		{
			document.getElementById("defencemenu").style.display = "none";
			defencemenu = true;
		}
	}	
	function togglemenu_machinery()
	{
		if(machinerymenu == true)
		{
			document.getElementById("portmenu").style.display = "none";
			portmenu = true;
			document.getElementById("defencemenu").style.display = "none";
			defencemenu = true;
			document.getElementById("machinerymenu").style.display = "";
			machinerymenu = false;
			document.getElementById("cargomenu").style.display = "none";
			cargomenu = true;
			document.getElementById("arupmenu").style.display = "none";
			arupmenu = true;
							
		}
		else
		{
			document.getElementById("machinerymenu").style.display = "none";
			machinerymenu = true;
		}
	}	
	function togglemenu_cargo()
	{
		if(cargomenu == true)
		{
			document.getElementById("portmenu").style.display = "none";
			portmenu = true;
			document.getElementById("defencemenu").style.display = "none";
			defencemenu = true;
			document.getElementById("machinerymenu").style.display = "none";
			machinerymenu = true;
			document.getElementById("cargomenu").style.display = "";
			cargomenu = false;
			document.getElementById("arupmenu").style.display = "none";
			arupmenu = true;
								
		}
		else
		{
			document.getElementById("cargomenu").style.display = "none";
			cargomenu = true;
		}
	}
	
	function togglemenu_arup()
	{
		if(arupmenu == true)
		{
			document.getElementById("portmenu").style.display = "none";
			portmenu = true;
			document.getElementById("defencemenu").style.display = "none";
			defencemenu = true;
			document.getElementById("machinerymenu").style.display = "none";
			machinerymenu = true;
			document.getElementById("cargomenu").style.display = "none";
			cargomenu = true;
			document.getElementById("arupmenu").style.display = "";
			arupmenu = false;
			
					
		}
		else
		{
			document.getElementById("arupmenu").style.display = "none";
			arupmenu = true;
		}
	}
		
	togglemenu_port();
	togglemenu_defence();
	togglemenu_machinery();
	togglemenu_cargo();
	togglemenu_arup();