function getStyleObject(objectId) {
    if (document.getElementById && document.getElementById(objectId)) {
    return document.getElementById(objectId).style;
  } else if (document.all && document.all(objectId)) {
    return document.all(objectId).style;
  } else {
    return false;
  }
}

function changeDiv(the_div,the_change)
{
  var the_style = getStyleObject(the_div);
  if (the_style != false)
  {
    the_style.display = the_change;
  }
}


function hideAllstd()
{
  changeDiv("std","block");
  changeDiv("cont","none");
}

function hideAllcont()
{
  changeDiv("std","none");
  changeDiv("cont","block");
}


function hideAll20()
{
  changeDiv("20","block");
  changeDiv("15","none");
  changeDiv("10","none");
}

function hideAll15()
{
  changeDiv("20","none");
  changeDiv("15","block");
  changeDiv("10","none");
}

function hideAll10()
{
  changeDiv("20","none");
  changeDiv("15","none");
  changeDiv("10","block");
}



function hideAll20a()
{
  changeDiv("20a","block");
  changeDiv("15a","none");
  changeDiv("10a","none");
}

function hideAll15a()
{
  changeDiv("20a","none");
  changeDiv("15a","block");
  changeDiv("10a","none");
}

function hideAll10a()
{
  changeDiv("20a","none");
  changeDiv("15a","none");
  changeDiv("10a","block");
}

function showPic (whichpic) {
 if (document.getElementById) {
  document.getElementById('placeholder').src = whichpic.href;
  if (whichpic.title) {
   document.getElementById('desc').childNodes[0].nodeValue = whichpic.title;
  } else {
   document.getElementById('desc').childNodes[0].nodeValue = whichpic.childNodes[0].nodeValue;
  }
  return false;
 } else {
  return true;
 }
}