function setNavGroup(mainNavGroup,subNavGroup)
{
    
    mainLinks = document.getElementById('nav').getElementsByTagName('li');
    for(j=0;j<mainLinks.length;j++)
    {
        if(mainLinks[j].className==mainNavGroup)
        {
            
            mainLinks[j].className = 'activeNav';
        }
        else
        {
            mainLinks[j].className = '';
        }
    }
    
    var subNav = document.getElementById('subNav');
    if(subNav)
    {
        sublinks=subNav.getElementsByTagName('a')
        for(i=0;i<sublinks.length;i++)
        {
            if(sublinks[i].className==subNavGroup)
            {
                sublinks[i].style.fontWeight = 'bold';
            }
            else
            {
                sublinks[i].style.fontWeight = '';
            }
        }
    }
    
  
}