// Figure out what we're dealing with first...

NS4 = (document.layers) ? 1 : 0;
IE4 = (document.all) ? 1 : 0;
DOM = (document.getElementById) ? 1 : 0;


// Show side menu function

function showsideMenu(sLayerName)
{

	if (NS4) 
	{
		document.layers[sLayerName].visibility = "show";
	} 
	else if (DOM) 
	{
		document.getElementById(sLayerName).style.visibility = "visible";
	} 
	else 
	{
		document.all[sLayerName].style.visibility = "visible";
	}	
	sLayerName = null;
}

// hide side menu

function hidesideMenu(sLayerName)
{
	if (NS4) 
	{
		document.layers[sLayerName].visibility = "hide";
	} 
	else if (DOM) 
	{
		document.getElementById(sLayerName).style.visibility = "hidden";
	} 
	else 
	{
		document.all[sLayerName].style.visibility = "hidden";
	}
}


// Show Menu function

function showMenu(sLayerName)
{

hideMenus();

	if (NS4) 
	{
		document.layers[sLayerName].visibility = "show";
	} 
	else if (DOM) 
	{
		document.getElementById(sLayerName).style.visibility = "visible";
	} 
	else 
	{
		document.all[sLayerName].style.visibility = "visible";
	}	
	sLayerName = null;
}

// Hide Menus function.

function hideMenus() 
{

oMenus = new Array('mnWelcome','mnSchoolLife','mnOurSchool','mnEnhancedLearning','mnAchievements','mnCommunity','mnPublications');
	
	for (i = 0; i < oMenus.length; i++) 
	{
		if (NS4) 
		{
			document.layers[oMenus[i]].visibility = "hide";
		} 
		else if (DOM) 
		{
			document.getElementById(oMenus[i]).style.visibility = "hidden";
		} 
		else 
		{
			document.all[oMenus[i]].style.visibility = "hidden";
		}	
	}
}