function Display(id,markid){
  if(document.all || document.getElementById){
    if(document.all){
      obj = document.all(id).style;
      markobj = document.all(markid);
    }else if(document.getElementById){
      obj = document.getElementById(id).style;
      markobj = document.getElementById(markid);
    }
    if(obj.display == "block"){
    	obj.display = "none";
	markobj.innerHTML =  "+";
    }else{
        obj.display = "block";
	markobj.innerHTML = "-";
    }
  }
}