var selectedSubMenuName = "";

function setSelectedSubMenuName(smn) {
	var oldSubMenu = selectedSubMenuName;
	
	selectedSubMenuName = smn;

	// deactivate old
	if (oldSubMenu != null && oldSubMenu != "" ) {
		rollMenu(oldSubMenu, 'off');
	}
}

function showPage(nextPage) {
	document.location.href = nextPage
}

function activateSubMenu(sm) {
	setSelectedSubMenuName(sm);
}

function isSelectedSubMenu(subMenuName) {

	if (selectedSubMenuName == subMenuName) {
		return true;
	}
	return false;
}

function roll(img_name,img_src) {
	document[img_name].src = 'resources/navi/' + img_src + '.gif';
}
function rollMenu(img_name, onOff) {
	if (onOff == "off" && isSelectedSubMenu(img_name)) {
		return;
	}
	
	document[img_name].src = 'resources/navi/' + img_name + '_' + onOff + '.gif';
}

function openWindow (URL, WinName, Features) { 
	window.open(URL, WinName, Features); 
} 

function openWindow2(URL, WinName) { 
	window.open(URL, WinName, ''); 
}