function mouseOver()
{
document.b1.src ="images/arrow_left_green.jpg";
}
function mouseOut()
{
document.b1.src ="images/arrow_left_black.jpg";
}


function mouseOver2()
{
document.b2.src ="images/arrow_right_green.jpg";
}
function mouseOut2()
{
document.b2.src ="images/arrow_right_black.jpg";
}