function changeOpac2(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}; 

function changeOpac(vis, id, dis) {
    var object = document.getElementById(id).style;
    object.display = dis;
    object.visibility = vis;
}; 

//visible
//block