function mouseOverMech()
{
document.b1.src ="images/mech.gif";
}
function mouseOutMech()
{
document.b1.src ="images/mechanic.gif";
}


function mouseOverDispatch()
{
document.b2.src ="images/dispatch.gif";
}
function mouseOut()
{
document.b2.src ="images/dispatcher.gif";
}