function navOver(name)
{
    img = getTag('nav_' + name);
    img.src = 'images/main_menu/m_' + name + '_on.gif';
}

function navOut(name)
{
    img = getTag('nav_' + name);
    img.src = 'images/main_menu/m_' + name + '.gif';
}


function getTag(tagid)
{
	if (document.getElementById)
	{
		return document.getElementById(tagid);
	}
	return document.all(tagid);
}