function on_duality(image) {
    document[image].src="../pics/products_navi_duality_mouse.gif";
    }   
function off_duality(image) {
    document[image].src="../pics/products_navi_duality.gif";
    }
function on_operator(image) {
    document[image].src="../pics/products_navi_operator_mouse.gif";
    }   
function off_operator(image) {
    document[image].src="../pics/products_navi_operator.gif";
    }
function on_enterprise(image) {
        document[image].src="../pics/products_navi_enterprise_mouse.gif";
    }
function off_enterprise(image) {
    document[image].src="../pics/products_navi_enterprise.gif";
    }    
function on_technology(image) {
    document[image].src="../pics/products_navi_technology_mouse.gif";
    }   
function off_technology(image) {
    document[image].src="../pics/products_navi_technology.gif";
    }
function on_customer(image) {
    document[image].src="../pics/products_navi_customer_mouse.gif";
    }   
function off_customer(image) {
    document[image].src="../pics/products_navi_customer.gif";
    }
// navigation 2 start
function on_future(image) {
    document[image].src="../pics/products_button_future_mouse.gif";
    }   
function off_future(image) {
    document[image].src="../pics/products_button_future.gif";
    }
function on_sales(image) {
    document[image].src="../pics/products_button_sales_mouse.gif";
    }   
function off_sales(image) {
    document[image].src="../pics/products_button_sales.gif";
    }
function on_architecture(image) {
    document[image].src="../pics/products_button_architecture_mouse.gif";
    }   
function off_architecture(image) {
    document[image].src="../pics/products_button_architecture.gif";
    }
    function on_security(image) {
        document[image].src="../pics/products_button_security_mouse.gif";
        }   
    function off_security(image) {
        document[image].src="../pics/products_button_security.gif";
    }
function on_downloads(image) {
    document[image].src="../pics/downloads_mouse.gif";
    }   
function off_downloads(image) {
    document[image].src="../pics/downloads.gif";
    }
// navigation 2 end