function trainover()
{
document.trains.src ="grafik/trains.jpg";
}
function trainout()
{
document.trains.src ="grafik/trains-bw.jpg";
}
function travelover()
{
document.travel.src ="grafik/travel.jpg";
}
function travelout()
{
document.travel.src ="grafik/travel-bw.jpg";
}
function truckover()
{
document.truck.src ="grafik/us-truck.jpg";
}
function truckout()
{
document.truck.src ="grafik/us-truck-bw.jpg";
}
function diverseover()
{
document.diverse.src ="grafik/diverse.jpg";
}
function diverseout()
{
document.diverse.src ="grafik/diverse-bw.jpg";
}