d = document;
d.$ = function ( obj_id ) {
    var obj;
    if( document.all )
    {
        obj = document.all[obj_id];
    }
    else if( document.getElementById )
    {
        obj = document.getElementById(obj_id);
    }
    else if( document.getElementsByName )
    {
        obj = document.getElementsByName(obj_id);
    }
    return obj;
}

function ChangeVisible (id) {
   if (d.$(id).style.display == "") {
       d.$(id).style.display = "none";
   } else {
       d.$(id).style.display = "";
   }
}