function cclass(obj,cls){ obj.className = cls; }
  
function rover(obj,bover){ 
    obj.style.backgroundColor=(bover)?"#E8E8E8":"";
    obj.style.color=(bover)?"#000000":""; 
}

var idopen=0;
function showobj(obj,x){
    //var msg="display: "+obj.style.display;
    //alert(document.all[obj].style);
    if(idopen!=0 || idopen==obj) obj.style.display = "none";
    if(idopen==obj){ idopen=0;return; }
    obj.style.display = "block";
idopen=obj;
}