function showelement(layer){
	
	var myLayer = document.getElementById(layer);
	var submenu1 = document.getElementById('submenu1');
	var submenu2 = document.getElementById('submenu2');
	var submenu3 = document.getElementById('submenu3');
	var submenu4 = document.getElementById('submenu4');
	var submenu5 = document.getElementById('submenu5');
	var submenu6 = document.getElementById('submenu6');
	
	if(submenu1.style.display="block"){
	submenu1.style.display="none";
	}
	if(submenu2.style.display="block"){
	submenu2.style.display="none";
	}
	if(submenu3.style.display="block"){
	submenu3.style.display="none";
	}
	if(submenu4.style.display="block"){
	submenu1.style.display="none";
	}
	if(submenu4.style.display="block"){
	submenu4.style.display="none";
	}
	if(submenu5.style.display="block"){
	submenu5.style.display="none";
	}
	if(submenu6.style.display="block"){
	submenu6.style.display="none";
	}
	
	if(myLayer.style.display="none"){	
		myLayer.style.display="block";
	}		
}