if(document.images) {

top_nav_expert = new Image()
top_nav_expert.src = "images/top_nav_expert.gif"
top_nav_expert_o = new Image()
top_nav_expert_o.src = "images/top_nav_expert_o.gif"
top_nav_company = new Image()
top_nav_company.src = "images/top_nav_company.gif"
top_nav_company_o = new Image()
top_nav_company_o.src = "images/top_nav_company_o.gif"
top_nav_clients = new Image()
top_nav_clients.src = "images/top_nav_clients.gif"
top_nav_clients_o = new Image()
top_nav_clients_o.src = "images/top_nav_clients_o.gif"
top_nav_news = new Image()
top_nav_news.src = "images/top_nav_news.gif"
top_nav_news_o = new Image()
top_nav_news_o.src = "images/top_nav_news_o.gif"
top_nav_contact = new Image()
top_nav_contact.src = "images/top_nav_contact.gif"
top_nav_contact_o = new Image()
top_nav_contact_o.src = "images/top_nav_contact_o.gif"

}

// -----------------------------------------------------------------
// -----------------------------------------------------------------


//Rollover function for navigation:
function rollOver(img1,ref1) {
    if (document.images) {
        document.images[img1].src = eval(ref1 + ".src")
    }
    }

// -----------------------------------------------------------------
// -----------------------------------------------------------------