/* TopNav */
function toggleImageOn(imageID, filename)
{
	toggleImagesOff();
    document.getElementById(imageID).src = filename;
}
function toggleImageOff(imageID, filename)
{
    document.getElementById(imageID).src = filename;
    toggleImageActive();
}

function toggleNav2ImageOn(imageID, filename)
{
    document.getElementById(imageID).src = filename;
}
function toggleNav2ImageOff(imageID, filename)
{
    document.getElementById(imageID).src = filename;
}

function toggleMenuOn(menuID)
{
    document.getElementById(menuID).style.visibility = 'visible';
	document.getElementById(menuID).style.top = '98px';    
}
function toggleMenuOff(menuID)
{
    document.getElementById(menuID).style.visibility = 'hidden';
	document.getElementById(menuID).style.top = '-500px';
}