function makeName(layerID) {
    if(document.getElementById) {
        return document.getElementById(layerID).style;
    } else if(document.all) {
        return document.all[layerID].style;
    } else if(document.layers) {
        return document.layers[layerID];
    }
}


function showLayer(layername)
	{
		mL = makeName(layername);
		mL.visibility="visible";
	}

function hideLayer(layername)
	{
		mL = makeName(layername);
		mL.visibility="hidden";
	}

function activateMenu(menuNumber)
	{
		showLayer('menuoff');
		for (i=1; i<=4; i=i+1)
	   		{
				hideLayer("menu" + i);
	   		}
		showLayer("menu" + menuNumber);
	}
	
function closeMenus()
	{
		hideLayer('menuoff');
		for (i=1; i<=4; i=i+1)
	   		{
				hideLayer("menu" + i);
	   		}
	}

function navgo(theURL)
	{
		document.location.href = theURL;
	}