function showMenu(xMenuName)
{
	hideAll();
	var oMenu = document.getElementById(xMenuName);
	oMenu.style.display = 'block';
}

function hideMenu(xMenuName)
{

	var oMenu = document.getElementById(xMenuName);
	oMenu.style.display = 'none';
}

function hideAll()
{
	var items = document.getElementsByTagName("*");

    var iLength=items.length;

    for(i=0; i < iLength; i++)
    {
    	if(items[i].id.indexOf('submenu') > -1)
    	{
    		hideMenu(items[i].id);
    	}
    }
}