function displayBlock(key,block){    if (document.getElementById) {      bobj = document.getElementById(block);      kobj = document.getElementById(key);     if (bobj.style.display == "none"){         bobj.style.display = "";         kobj.innerHTML = kobj.innerHTML.replace("+","-");      }      else {         bobj.style.display = "none";         kobj.innerHTML = kobj.innerHTML.replace("-","+");      }    } }