function showonlygroup(prefix,num){
  plen=prefix.length;
  obj = document.getElementsByTagName("div");
  for(c=0;c<obj.length;c++){
    if(obj[c].id.substr(0,plen)==prefix){
	  if(obj[c].id == ''+prefix +num+''){
		 showdiv(''+obj[c].id+'');
	  }
	  else{
		 hidediv(''+obj[c].id+'');   
	  }
	}
  }
}

function hidediv(id) {
    obj = document.getElementsByTagName("div");
    obj[id].style.display = 'none';
}

function showdiv(id) {
    obj = document.getElementsByTagName("div");
    obj[id].style.display = 'block';
}

function showhide(id){
  obj = document.getElementsByTagName("div");
  if(obj[id].style.display=='block'){
    hidediv(id);
  }
  else{
    showdiv(id);
  }
}
var selected =  null;

function show(id){
	if(selected != null){
		hide(selected);
	}
	document.getElementById(id).style.display = "block";
	selected = id;
}

function hide(id){
	document.getElementById(id).style.display = "none";
}