function hs(d) {
if (document.getElementById){
obj = document.getElementById(d); djb = document.getElementById(d+'_text'); 
if (obj.style.display == "none"){ obj.style.display = ""; djb.innerHTML = djb.innerHTML.replace("+","-"); }
else { obj.style.display = "none"; djb.innerHTML = djb.innerHTML.replace("-","+"); }
}
}