var leftNavItem;
var submenuItem;
var menuBaseName = "submenu_";
var numberOfMenus = 3;

function showLeftMenu() {
	// Hide submenus
	var i;
		for(i = 0; i < numberOfMenus; i++){
			var box = document.getElementById(menuBaseName + i);
			if(box){
				box.style.display = "none";
			}
		}
	//Show appropriate submenu if needed
	if (!(leftNavItem == null)){
		var id = menuBaseName + parseInt(leftNavItem);
		var menu = document.getElementById(id);
		if(menu){
				menu.style.display = "block";
		}
		
		//Display Submenu
		if (!(submenuItem == null)){
			var span = document.getElementById('span' + '_' + leftNavItem + '_' + submenuItem);
			var a = document.getElementById('link' + '_' + leftNavItem + '_' + submenuItem);
			if(a){
				a.style.display = "none";
			}
			if(span){
				span.style.display = "block";
			}	
		}
	}
}