var active_hidden_text = "";
function show_hidden_obj(obj){
if(document.getElementById(obj).style.display == 'block'){
document.getElementById(obj).style.display = 'block';
}
else{
document.getElementById(obj).style.display = 'block';
}
if(active_hidden_text != "" && active_hidden_text != obj){
document.getElementById(active_hidden_text).style. display = 'none';
}
active_hidden_text = obj;
}