var objPage = null;
			
			function showPage(pageName) {
				if (objPage) objPage.style.display = 'none';
				objPage=document.getElementById(pageName);
				objPage.style.display = 'block';
			}
			
var objMenu = null;
			
			function showMenu(pageName) {
				if (objMenu) objMenu.style.display = 'none';
				objMenu=document.getElementById(pageName);
				objMenu.style.display = 'block';
			}

var objView = null;
			
			function showView(pageName) {
				if (objView) objView.style.display = 'none';
				objView=document.getElementById(pageName);
				objView.style.display = 'block';
			}

var objText = null;
			
			function showText(pageName) {
				if (objText) objText.style.display = 'none';
				objText=document.getElementById(pageName);
				objText.style.display = 'block';
			}