/* main menu function */

function highlightSubMenu(num)
{
	if (num == null || num <= 0) return true;
	var theId = "submenu" + num;
	
	var temp = document.getElementById(theId);
	temp.className = "sub_menu_hl";
	temp.attributes["class"].nodeValue = "sub_menu_hl";
}

function highlightMenu(num)
{
	if (num < 0) return true;

	var theId = document.getElementById("menu" + num);
	theId.className = "main_menu_sel";
	theId.attributes["class"].nodeValue = "main_menu_sel";
}


/* pop up menu function */
function showSubmenu(submenuId) 
{
	var submenu = document.getElementById(submenuId);
	submenu.style.display = "block";
}

function hideSubmenu(submenuId) 
{
	var submenu = document.getElementById(submenuId);
	submenu.style.display = "none";
}