function hoverover( newThumb ) {
obj = document.getElementById(newThumb);
obj.style.MozOpacity=.5;
obj.style.opacity=.5;
obj.style.filter = 'alpha(opacity=50)';
}

function hoverout( newThumb ) {
obj = document.getElementById(newThumb);
obj.style.MozOpacity=1;
obj.style.opacity=1;
obj.style.filter = 'alpha(opacity=100)';
}