//detect browser rollover capability function

var roll = 'false';

if (document.images)
    roll = 'true';
        
//image rollover function

function shmsover(img,refA,refB) {
    if (roll == 'true') {
        document.images[img].src = refA;
        document.images["roll_truck"].src = refB;
    }
}
        
function shmsout(img,refA,refB) {
    if (roll == 'true') {
        document.images[img].src = refA;
        document.images["roll_truck"].src = refB;
    }
}