function switch_arrow(my_id) {
    var elem = document.getElementById(my_id);
    var str = elem.className;

    if (str.indexOf('closed') > -1) {
	elem.className = str.replace('closed', 'open');
      } else {
	elem.className = str.replace('open', 'closed');
      }
    }

function ShowUtils()
{
    document.getElementById("authorinfo").style.display = "";
    document.getElementById("showinfo").style.display = "none";
    document.getElementById("hideinfo").style.display = "";
}


function HideUtils()
{
    document.getElementById("authorinfo").style.display = "none";
    document.getElementById("showinfo").style.display = "";
    document.getElementById("hideinfo").style.display = "none";
}