function travelling_in()
				{
					document.getElementById("travelling_menu").style.visibility="visible";
					document.getElementById("travelling").style.backgroundImage="url(images/btn_travelling_over.gif)";
				}
				
				function travelling_out()
				{
					document.getElementById("travelling_menu").style.visibility="hidden";
					document.getElementById("travelling").style.backgroundImage="url(images/btn_travelling.gif)";
				}
				
				function culture_in()
				{
					document.getElementById("culture_menu").style.visibility="visible";
					document.getElementById("culture").style.backgroundImage="url(images/btn_culture_over.gif)";
				}
				
				function culture_out()
				{
					document.getElementById("culture_menu").style.visibility="hidden";
					document.getElementById("culture").style.backgroundImage="url(images/btn_culture.gif)";
				}
				
				function rides_in()
				{
					document.getElementById("rides_menu").style.visibility="visible";
					document.getElementById("rides").style.backgroundImage="url(images/btn_rides_over.gif)";
				}
				
				function rides_out()
				{
					document.getElementById("rides_menu").style.visibility="hidden";
					document.getElementById("rides").style.backgroundImage="url(images/btn_rides.gif)";
				}
				
				function region_in()
				{
					document.getElementById("region_menu").style.visibility="visible";
					document.getElementById("region").style.backgroundImage="url(images/btn_region_over.gif)";
				}
				
				function region_out()
				{
					document.getElementById("region_menu").style.visibility="hidden";
					document.getElementById("region").style.backgroundImage="url(images/btn_region.gif)";
				}
				
				function infocenter_in()
				{
					document.getElementById("infocenter_menu").style.visibility="visible";
					document.getElementById("infocenter").style.backgroundImage="url(images/btn_infocenter_over.gif)";
				}
				
				function infocenter_out()
				{
					document.getElementById("infocenter_menu").style.visibility="hidden";
					document.getElementById("infocenter").style.backgroundImage="url(images/btn_infocenter.gif)";
				}