function showLayer(showMe) {
	var i=1;
	while(myElem = eval("document.getElementById('menu_"+i+"');")) {
	
		if(i==showMe){
		 myElem.style.display = '';
		}
		else {
		 myElem.style.display = 'none';
		}
		i++;
	}
}

function wrapper(showNum) {
	var myElement = eval("document.getElementById('menu_"+showNum+"');");
		if(myElement.style.display == '') {
		 myElement.style.display = 'none';
		}
		else {
		 showLayer(showNum);
		}
}