function changeCssClass(id)
{
	var e = document.getElementById(id);
	if(e.className == "mainNavigationItemLevelArrowHidden")
		e.className = "mainNavigationItemLevelArrow";
	else
		e.className = "mainNavigationItemLevelArrowHidden";
}
function hideWarningMessage()
{
    var warning = document.getElementById("warningContainer");
    warning.style.display = "none";
}