function rolloverButton(name,type)  
{
    strSrc = 'images/layout/arrow' + type + '.gif';
    document.images[name].src = strSrc;
}
//for car
function rolloverCar(name,type)  
{
    strSrc = 'images/car/' + type;
    document.images[name].src = strSrc;
}
//for back button
function rolloverBackButton(name,type)  
{
    strSrc = 'images/layout/back' + type + '.gif';
    document.images[name].src = strSrc;
}
//for left nav
function rolloverLeftNavButton(name,type)  
{
    strSrc = 'images/layout/arrow_left_nav' + type + '.gif';
    document.images[name].src = strSrc;
}