function nav_on(id)
{
    // enable bullet
    var obj = document.getElementById('bullet_' + id);
    obj.src = 'resources/images/templates/bullet_on.gif';
    
    obj = document.getElementById('image_' + id);
    obj.src = 'resources/images/templates/title_' + id + '_on.gif';

    if (id != 'welcome') {
        var welcome_bullet = document.getElementById('bullet_welcome');
        obj = document.getElementById('image_welcome');
        obj.onmouseover = function(){this.src='resources/images/templates/title_welcome_on.gif'; welcome_bullet.src='resources/images/templates/bullet_on.gif';};
        obj.onmouseout = function(){this.src='resources/images/templates/title_welcome_off.gif'; welcome_bullet.src='resources/images/templates/bullet_off.gif';};
    }

    if (id != 'faqs') {
        var faqs_bullet = document.getElementById('bullet_faqs');
        obj = document.getElementById('image_faqs');
        obj.onmouseover = function(){this.src='resources/images/templates/title_faqs_on.gif'; faqs_bullet.src='resources/images/templates/bullet_on.gif';};
        obj.onmouseout = function(){this.src='resources/images/templates/title_faqs_off.gif'; faqs_bullet.src='resources/images/templates/bullet_off.gif';};
    }
    
    if (id != 'terms') {
        var term_bullet = document.getElementById('bullet_terms');
        obj = document.getElementById('image_terms');
        obj.onmouseover = function(){this.src='resources/images/templates/title_terms_on.gif'; term_bullet.src='resources/images/templates/bullet_on.gif';};
        obj.onmouseout = function(){this.src='resources/images/templates/title_terms_off.gif'; term_bullet.src='resources/images/templates/bullet_off.gif';};
    }
    
    if (id != 'hcp') {
        var hcp_bullet = document.getElementById('bullet_hcp');
        obj = document.getElementById('image_hcp');
        obj.onmouseover = function(){this.src='resources/images/templates/title_hcp_on.gif'; hcp_bullet.src='resources/images/templates/bullet_on.gif';};
        obj.onmouseout = function(){this.src='resources/images/templates/title_hcp_off.gif'; hcp_bullet.src='resources/images/templates/bullet_off.gif';};
    }
}

/* for popup */
function checkHCP()
{
    var popup = document.getElementById('hcp_popup');
    var fade  = document.getElementById('popup-bg');

    if (isHCPVerified() == true)
    {
        popup.style.display = 'none'; 
        fade.style.display = 'none'; 
    }
    else
    {
        if (popup.style.display != 'block') 
        {
            popup.style.display = 'block';
            fade.style.display = 'block';
        } 
        else 
        {
            popup.style.display = 'none'; 
            fade.style.display = 'none'; 
            setHCPVerified();
        }
    }
}